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Polyester and Epoxy
Todd wrote:
On Jan 4, 6:55 pm, "My news" wrote: Any advise or comment if I will use polyester and fiber glass on top of cured and sanded epoxy on stich and glue? My plan is to prime the entire hull with epoxy for a good bind before the application of fiberglass/polyester skin. I want to introduce this idea to the poor fishermen in the Philippines for economic reason. The epoxy will be softened by the polyester and MEK. It will be a big mess. The *only* way I have ever heard of to get a satisfactory bond with standard polyester resin over normal epoxies is wait several months for the epoxy to totally cure, abrade the **** out of it and apply a barrier and bonding coat of G4 Pond Sealer then lay up the polyester laminate while the G4 is still tacky. Ideally the area of epoxy to be overcoated should be kept to a minimum as G4 works very well on wood and other porous substrates. Its doubtful whether full sheathing on a working boat will, in the long term, be maintained well enough to prevent water penetration and accelerated rot. If the intention is to prevent worm damage, it may be a reasonable solution, but the initial expense is likely to be high enough that only rich fishermen can afford it, even though they will save money over the life of the vessel. I don't think encouraging the use of large quantities of expensive resins is going to do much for a sustainable fishing industry in poor communities. Expensive boats with large loans outstanding on them *will* lead to overfishing as the boat owners do what it takes to reduce their debt. I fear that this may well seriously worsen the circumstances of poor fishermen. -- Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL: |
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