Lightest Coating

[Yankee Dog]

Getting ready to order the 6oz polyester.  What is the lightest material I can use to coat the fabric.  

[Hirilonde]

Hmmmm, interesting question. Can't say that anyone has asked it before. It's the weight when dry that matters, and how much of the material it takes to waterproof the boat. I don't know where you could get data on either.

[Kudzu]

I doubt there is any practical difference in any of them.

[Yankee Dog]

Since I am prone to experimentation, I may try Locktite PL Roof and Flashing  Sealant.  I did an experiment and it held water until it evaporated.  Dried to a rubbery finish that held up to a screwdriver.  I could wad it up with no cracking or delamination.  Black in color and will hold up to UV.   

 

Long term.

 

I tried the PL construction adhesive.  It worked well, but my paint would not adhere.  So the boat still floats and paddles well, but the paint looks like poop. 

[Kudzu]

If your going to paint, skip the goo and just paint it.  Proven to work and last.

[Hirilonde]

I don't understand why you would want to use goo either.  If after painting you have a hole opened up along the seam from sewing, then maybe use a dab there.  But use a paintable goo and only if you have to, and sparingly.

[Yankee Dog]

The black flashing goo does not require painting.  It dried to a non tacky rubbery finish.   my test found it to be unmarked after repeated stabbing with a screwdriver and totally flexible and waterproof.  

 

It is certainly more difficult to apply than pant. On the other hand t only requires a single coat.  Oh well, still undecided.  I have until the skin arrives and I sew a t on to decide.  What do I have the lose beside $140 for another skin.

[benhardt57]

I hope it works out for you, but this approach is surprising when the title of your post is "lightest coating". I'm thinking it ends up heavier than Rustoleum.

-Ben

[Yankee Dog]

On 5/17/2021 at 7:40 PM, benhardt57 said:

I hope it works out for you, but this approach is surprising when the title of your post is "lightest coating". I'm thinking it ends up heavier than Rustoleum.

-Ben

 

Im afraid you might be right.  The rustoleum will take about what, 1/2 gallon.  Yes, no, maybe....?

 

I estimate 2 or 3 tubes of the goop?   

 

Decisions Decisions...... 

[Kunzie]

I had 1 1/2 quarts of Rust oleum on my Vardo.

[Hirilonde]

12 hours ago, Kunzie said:

I had 1 1/2 quarts of Rust oleum on my Vardo.

Same, 3 coats.

 

[Yankee Dog]

Look what I found.   

 

 Refer to the Material Safety Data Sheet (MSDS) where it should tell you the percent weight solids of the paint. Suppose the % Wt solids is 60% and the weight of the paint is 9.0 lbs/gal, then the weight of the solid paint will be 5.4 lbs/gal. If you intend to spray apply the coating to the aircraft using an HVLP spray gun, you can guesstimate that your transfer efficiency will be about 50%. In other words for every gallon of paint that you use, only 2.7 lbs of solid paint is deposited on the aircraft.  The remainder falls to the floor or goes into the filters of a spray booth. Hence, if you know approximately how many gallons of paint you will need to purchase, you can estimate the weight of the solid paint that will be deposited.

 

[Hirilonde]

I dare anyone to prove with evidence that it makes even a half pound difference for products to properly waterproof a SOF boat.