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Showing content with the highest reputation on 04/20/2018 in all areas

  1. Jamestown Distributors used to publish a chart with the tensile strengths of bedding/sealants. I found it very useful and memorized the key products I used They went in order of bonding strength: 1. 3M 5200 - 700 psi polyurethane - extremely adhesive ( I use this only when I see no need to take it apart ever. There is a serious danger of damage doing so.) 2. 3M 4200 - 300 psi polyurethane 3. Sikaflex 291 - 220 psi polyurethane (I use this when I really want white that won't yellow and I can live with the nuisance taking things apart later) 4. 3M 101 and BoatLife LifeCaulk - 150 psi polysulfides (These are my beddings of choice for hardware. The only problem is that the white will yellow over time.) 5. Dolfinite - nil - oil based goo - not an adhesive at all (AKA boatyard bedding. This is the product from the old days.) OK, they still have one, but I had to look: https://www.jamestowndistributors.com/userportal/document.do?docId=1170&title=Marine+Adhesives+Strength+and+Usage+Comparison+Chart I find the most important technique for using any but Dolfinite is to smear both surfaces and make sure no bubbles or voids exist, then put them together with at least some ooze out all the way around. Masking can make clean up easier and in some cases I leave the ooze to cut off later with a utility knife.
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  2. It never bothers me when someone thoughtfully evaluates a boat, idea, design, etc., even mine. It is through honest opinions well worded that we all learn, or at least learn of other points of view. Even if we disagree on the details.
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