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Boat Forum / Building / May 2008PVA
I would like to find some PVA, quick. I need to make some gelcoat repairs today, and I understand that spraying PVA on top keeps the gelcoat (white) from discoloring. I'm not sure where you find PVA, but I think I've heard that hairspray works. Is this true, or where might I find the real stuff ? > I would like to find some PVA, quick. > > I need to make some gelcoat repairs today, and I understand that spraying > PVA on top keeps the gelcoat (white) from discoloring. PVA is used on top of gelcoat to promote curing, as it seals off the surface from the air. You can accomplish the same thing by purchasing "finish gelcoat" instead of the typical "laminating gelcoat". Finish gelcoat contains a wax that migrates to the surface and seals it so it will cure properly. I've never heard of PVA having any effect on gelcoat color. > I'm not sure where > you find PVA, but I think I've heard that hairspray works. I find that very doubtful. > Is this true, or where might I find the real stuff ? Any decent marine supplier will have it. >> I would like to find some PVA, quick. >> [quoted text clipped - 17 lines] > > Any decent marine supplier will have it. I've sprayed PVA over polyester laminating resin to make it non-gummy when cured. Never heard anything about gellcoat though. Richard  Signature(remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne >>> I would like to find some PVA, quick. >>> [quoted text clipped - 22 lines] > > Never heard anything about gellcoat though. It's the same principle, as both are polyester resin products. >>>> I would like to find some PVA, quick. >>>> [quoted text clipped - 24 lines] > > It's the same principle, as both are polyester resin products. Yes, but gell coat has wax mixed in - same as finishing resin. The Wax floats to the surface during cure and blocks off contact with air. PVA (or anything else) is not required. Richard Signature(remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne >> It's the same principle, as both are polyester resin products. > [quoted text clipped - 5 lines] > > Richard Polyester Gel coat comes in waxed and non waxed, non waxed is usually used for in in-mold layup where the gel coat can cure hard without the presence of air. You can add wax to non waxed for non mold or in air curing or use non waxed and seal from air to give a hard cure by covering with something like PVA. PVA works, as would almost any other air barrier.. >>>It's the same principle, as both are polyester resin products. >> [quoted text clipped - 12 lines] > covering with something like PVA. PVA works, as would almost any other > air barrier.. Ya got me there, Jerry. In that case PVA should work fine... Richard Signature(remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne >I would like to find some PVA, quick. > >I need to make some gelcoat repairs today, and I understand that spraying >PVA on top keeps the gelcoat (white) from discoloring. I'm not sure where >you find PVA, but I think I've heard that hairspray works. Yes, Aquanet works. Thanks Dan; but are you saying that hairspray works for sealing the gelcoat, or that it works as hairspray ? Just checking to be sure. >>I would like to find some PVA, quick. >> [quoted text clipped - 3 lines] >> > Yes, Aquanet works. Garland Gray II ha scritto: > I would like to find some PVA, quick. > [quoted text clipped - 3 lines] > > Is this true, or where might I find the real stuff ? Isn't PVA just the common and cheap white wood glue you may find in plastic cans at every hardware store? Here we call it Vinavil but it is a brand name (like we use Biro for ballpoint pens...). Daniel Daniele Fua brought forth on stone tablets: > Garland Gray II ha scritto: > [quoted text clipped - 12 lines] > > Daniel Close, but not quite (although it might work jsut fine for sealing out air). The PVA in white glue is polyvinyl acetate. The PVA being discussed in this thread is polyvinyl alcohol. bob Thanks all. I'll try to find the real stuff. The urgency has passed. >I would like to find some PVA, quick. > [quoted text clipped - 3 lines] > > Is this true, or where might I find the real stuff ? |
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