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PAR

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Everything posted by PAR

  1. Don't mix in little cups, which just "masses" the goo and accelerates the cure process. Mix in a flat bottom, wide tray and spread it out as soon as it's completely mixed, into a uniformly thin sheet of goo.
  2. You must remember some of the information in the MSDS is lawyer driven and also on legislation. For example a test conducted in California lab rats (for example), which were force fed epoxy molecule elements daily for a month, might show a proclivity toward a certain reaction, cancer or illness potential. This doesn't mean it's the case with the casual user or even the professional that also swims in the stuff, but if you start eating goo on toasted rye bread every day, you might have some issues. In other words, some of the information is published, "just in case" (read law suits) and possibly for reasons not as simple to understand.
  3. Nice looking stuff there. 50 - 70 MPH winds, that's just a summer thunderstorm around here, without the 20,000 lightening hits per hour, to add to the enjoyment.
  4. Yeah, Thiokol was the first generation of polysulfide and worked pretty good, especially in continuous immersion applications on raw wood. 3M-5200 is a polyurethane and though used by many, I don't recommend it in this application (long term immersion), unless the seam can be continuously compressed during the full cure process (a few weeks). I've seen the polyurethanes peel or easily pulled from a seam that had a bead applied by a caulk gun (no pressure). You should have mentioned it. I have a good way to open up the seams and cut the rivets or clenches at the same time. A fine tooth hacksaw blade, maybe with some tape around one end to make it more comfortable is the ticket. You wedge open a seam just enough to slide the blade it, then, using the lap as a guide, slowly cut through the goo, until you find a fastener, which of course you quickly hack though, just to continue on to the next. Some of these used screws into the frames, so you'd switch to digging out the putty and backing it out. The nice thing is the lap is also cleaned up in the process and it helps to use a slightly dull blade (interestingly enough), as it's easy to get too aggressive with a sharp one and dig into the laps. With just a portion of one seam missing the goo, you still have lots of friction and moisture gain to keep things fairly tight, from surrounding goo and fasteners, so not as much of a surprise to me. Repairs on these old laps is where I cut my teeth, as no one in this area wanted to touch them, because they didn't know or understand how and why things were done the way there were, along with the perception they were tough to redo. The goo wasn't a glue so much as a sealant, to absorb plank movement with moisture gain/lose cycling. It's still a traditional lap method, with the fasteners and lap friction making it tight. The goo just helped longevity and the perception they leaked more than other methods. Plank end landings on the stem are a common area of trouble with these puppies as are the garboards, which get worked more than all the rest of the planking, plus get oil soaked under the engine(s). The broad strakes (next out from the garboards) also work loose, though not at the rate of the garboard. Lastly is the sheer strake, which gets moisture trapped behind it from the clamp and side deck, causing rot. It took me years to figure out all the nuances of these old lap strakes, but once you understand the why and how, repairs become much easier. If doing a more extensive repair (the whole bottom for example), I'd epoxy the seams, but for repairs it's better to just do it the way it was originally. Lastly, you should find a thin string of cotton, buried in the bottom of the rabbet on the stem and keel. It's pretty important it goes back in.
  5. Cadence is one of the things that's changed over the years, but anything uniform at 110 to 130 per minute will do. Any good dance song will do, as will marching music if this come more easily, both at typically 120 beats per, which is fine. Most go too fast, with the excitement of the events around them (people yelling "help them", ambient noises, distractions, nervousness, Adrenalin surge, etc.). The important thing is to remain as calm as practical and focus on the task. If you do it right, you should break into a sweat pretty quickly.
  6. What did you use in the laps? Given the age of your skiff, Chris Craft used polysulfide (3M-101), which is ideal for underwater seams on non-encapsulated timber or plywood. If you did encapsulate the replacement planking, polyurethane will do (3M-5200) if the boat will be trailer borne and not spend extended time in the water (a week or more). If it's to be berthed for extended periods, polysulfide is the choice.
  7. You don't need to acknowledge compliments, your work does fine all by itself. Once epoxy is hard, though still chemically reactive, sanding it is much more an airborne particulate issue than an absorption through the skin concern. This said, certain areas can be overly sensitive to cured dust, like armpits, the groin and other typically sensitive to the touch, thin epidural locations. Hair spray in these areas can seal the pores temporary and make you smell like a French hooker for a few hours. Baby powder (talc) is nearly as effective, but sweat washes it off quickly. Retail products like "Liquid Glove" and similar also can seal the skin, so these areas don't get dried dust impacted into the pores. Of course, a Tyvek suit is handy, but tape the sleeves closed under the gloves and maybe the neck too, just to be sure, if you've found yourself to be sensitive to certain brands. In the end, once you've become sensitive to a brand or epoxy as a whole, stop and give yourself 2 or 3 months off and switch brands. Most will recover and can move on again, with renewed adherence to procedures with a new brand. I've only met a handful of folks that haven't had success with this recovery approuch, but they also admit to swimming in it for many years on the job. I personally believe that if you have enough exposure, with less than admirable procedures, eventually it does enough damage that you just can't go back without a full EV suit and respirator system. In most cases, it's the additives in the hardener that cause folks the sensitivity. In some, it's the base resin type used by the formulator, but 90% of the time it's the hardener. FWIW, West System 205 hardener is one of the most common ones that comes up in conversation, with folks that have become sensitized, which may just be a statistical thing, as they are the industry leader, selling the most goo. The other one that comes up a frequently is Fiber Glass Coatings Inc. goo. I know they've come up with newer formulations in recent years, so this may have changed, but I haven't compaired their MSDS sheets in a few years.
  8. Most epoxy "sensitization" occurs by sanding cured, but not fully cured epoxy. To a lesser degree those that swim in the stuff, taking the safe guards to undesirable levels also in time can become sensitive. Switching brands can help, but mostly just following the well understood precautions is all most need to do. Yep your correct, epoxy will continue to cure, long after it's dry and can be sanded, up to two weeks with some formulations. This is the usual "exposure" time for most. If you can wait, go for you, but I have to admit, I can't wait that long. Most of the time I want o be "on it" as soon as practical, so I wear a mast. Of course, there's no test that I know of to tell if the epoxy is 100% cured or still in the "I'm getting there" mode. I'm lucky, in that I've only experienced epoxy sensitivity once, very early with my exposure, when my habits weren't what they should be. I cleaned up my act, switched brands and had a few months break from major work and it went away. I haven't had to deal with it since, so I'm lucky, but do sympathize with those that do. I have a buddy that stops be the shop every so often and he's so sensitized, if he sees one particular brand anywhere, he will not come in. I've stopped using that brand, but he still asks. Hang tough Robert, you're getting there and doing a nice job (as usual) in the process.
  9. Personally, I like toe rails bedded, because it requires a caulk line which is easier to paint/varnish against. It also means you can remove it, clean up any dings and nicks, re-varnish to perfection and reinstall over more beading. I find this neater to do, but it all depends on you. The toe rail will be more waterproof and durable if it's 'glassed place, but varnishing is more difficult as are repairs, this way. If I 'glassed it down, I'd likely paint it instead of varnish, which can look nearly as good and is much easier to maintain. I did this on a buddy's 40' power yacht a few years ago (refinished the whole exterior). Only the rail cap (really nice mahogany) was left varnished. The rest of the bright work; cabin top trim, windshield frame, grab rails, bases under ventilators, etc., were painted a similar brown as the rail caps varnish. He didn't even notice I painted them for a week, when I got a call about "you painted my varnish . . .". "Yeah Pete, I painted your varnish, but you didn't notice for a week and it's a whole lot easier to touch up the paint or even redo the paint than the varnish, so do you want me to strip them down and apply more varnish, or" . . . Having owned this old wooden cruiser for a couple of decades and applied many gallons of varnish, never being fully satisfied with the quality of the finish or it's longevity . . . he understands now.
  10. Yeah, life can be tough here in central Florida, but someone has to do it. This winter we had one morning in late December where it got down to 32 degrees for about 45 minutes and two days in early January with near 32 degree temperatures for a few hours in the wee morning bits. Very occasionally we'll stay in the 50's during daylight. It's not uncommon to have 50's at night, though this year not many days at all, with general lows in the low 60's and daytime highs several degrees over the average. Today was 82, and tonight a cold front will drop in, so maybe we'll touch the 50's for a couple hours, but I'm not holding my breath. Tomorrow will be close to average for a change, but then back to higher than normal temperatures, until the weekend, where we'll get back to the averages again. All this said, I've still had to get things done with some cool weather, if occasionally and these heaters work good. I also use them to accelerate curing, which they do quite well too. If you can raise the ambient temperature by 20 degrees during the cure, you'll half the cure time. Another 20 degrees higher and you'll 1/4 the cure time, so it can offer benefits other than cold weather accommodation. So, if you have a goo that needs 12 hours to cure hard enough to sand lightly, take it to 115 degrees under a tarp and it's cooked in 3 hours, which a big difference. I often work with slow and supper slow formulations and this permits long setup and working time, but waiting for a cure, so I'll cook it and get the best of both worlds.
  11. Toe rail or rub rail? I like to leave rib rails mechanically fastened over bedding, because it's going to get replaced eventually, so this should be relatively easy. If glued, it will not be. Toe rails too get replaced, but usually after it got bashed by something, so not the eventuality of a run rail. As far as I'm concerned, a toe rail on a small sailor is just a decorative device, so maybe you can just glue it down.
  12. In 50 degree weather these little puppies will easily bring interior temperatures into the 80's, even with lots of drafts. Before I sealed and insulated the barn (now air conditioned!) I found that clear thin plastic painter'as drop cloth stuff worked very well at sealing up areas within the barn, so the heaters could really get some heat on. A 1,500 watt heater will run on an extension cord, though it's amp draw will rise a little if much over 50' long. I've run them on a 12 gauge 100' cord with no issues.
  13. The marks of a well designed small craft . . . an engine, gallows, boarding ladder and the skipper sitting at the very stern and she's still holding her butt up. Not and easy thing to arrange and still have reasonable performance too . . .
  14. $20 WalMart . . . 1,500 watts and can heat a single car garage to 75 degrees in freezing weather, assuming some modest insulation or a reasonably tight space (air leaks). I have several of these and can get 130 - 140 degrees under and insulated tarp (tarp with blankets tossed on top), which will post cure epoxy very quickly. At 1,500 watts, you'll need separate electrical circuits (for each one), if running them full blast for a while or it'll just pop breakers if on the same branch circuit.
  15. I don't use the car battery trick, I simply used a torch and heated the exposed end of the wire, which very quickly conducted it. The nice thing about copper wire is you don't have to worry about digging it all out, if some gets buried, but steel would need to come all out.
  16. I'd suspect the CS series in general would get spanked pretty bad, by the current rating systems, so you might be better off just letting your local committee offer you a rate, on observed performance potential and race finishes. Depending on politics within the committee and your experiences with them, the rate will move around, but after a season, they'll get you reasonably sorted.
  17. I've found I don't use wires to stitch things any more, but when I did, I found bare copper much more desirable than steel bailing wire or rebar ties. The copper is more malleable, easier to twist and takes heat much faster for removal too. 14 gauge for most everything and 12 gauge for the harder to pull in areas.
  18. Pretty blade. You could just continue what your child has begun and wash that piece of plywood with more of the oil, to even out the color. It'll eventually dry and can be over coated or you can extract the oils with solvents, before over coating.
  19. This is the answer to everything, so this question may be too specific for 42 . . .
  20. I hope he paid his dues to the boat renaming gods appropriately, or ill will can befall this puppy. If you may have been slightly remiss in this regard, I have a good source for prepubescent, virginal pee out of Maine if you need it . . .
  21. I became a paramedic when I left the Army in the early 70's and have preformed countless "sessions". Some things have changed slightly, but the physical act, if you want to be successful (including a great deal of luck) is going to bust up the cage. When you look into the statistics, it's a wonder anyone survives, particularly with certain histories and over certain ages. The only real answer for the death of 1 out of every 3 is education about your history, diet and most importantly how you cope with stress. The ability to deal with stress is a big one and 80% of the things that your health can do to you (cancers and most of the other usual illnesses), has a major common denominator - stress. I've answered calls where we knew within 30 seconds after arrival, the outcome wasn't going to be a good one, just by getting a few answers to basic questions from family and simple observations, regardless of the compression count, speed, depth, etc. Get educated and some dummy time, but most importantly come to peace with yourself, your history, genetics, diet and learn to accept the realities of life and how fleeting in can be for some. This doesn't mean grab a greeting card for the grim reaper and curl up in a rocking chair for the long wait, but does mean you can lessen your odds considerably, with some knowledge, "model changes" and trying to keep fit, especially mentally. My point is - it's not the "act" but the whole play and you can be a good actor or a not so good one. Yeah, one is more fun, but once you've survived a cardiac event, you'll understand this reference more clearly and you don't have to stand by for this eventuality. Tthere's plenty you can do, before the big wrestling match, with the guy holding the scythe. I've fought this fella many times, including my own stupidity. I got lucky and squared up for the most part. So don't wait, for most of you it's a 1 out of 3 shot, so you feeling lucky or not? Sermon over . . .
  22. You don't need to renew your CPR certification, unless it's required for something. You only need to be still strong enough, to break a victim 's sternum and/or ribs.
  23. The nice thing about a wood framed windscreen is you can hinge the panels, so you can have various amounts of air, as required. If not, these things are pretty simple to make with some precautions and a little heat.
  24. Cutting an oily species isn't a problem, though coating can be, so you only need to remove the oils, just prior to epoxy coating.
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