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sticky finish
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FLD
FLD
posted 10 Years Ago
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I make a few parts in cheapo GRP. I have no shame!! I've made some parts recently and I've found the open surface has remained tacky although the laminate has cured. I catalysed at 3% as normal but the resin I use (East coast) used to be blue and is now brown. Could it be the resin blend or have I started doing something wrong?
Any ideas on if I can salvage the parts with a solvent wipe or something similar?
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fgayford
fgayford
posted 10 Years Ago
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FLD (09/12/2015)
I make a few parts in cheapo GRP. I have no shame!! I've made some parts recently and I've found the open surface has remained tacky although the laminate has cured. I catalysed at 3% as normal but the resin I use (East coast) used to be blue and is now brown. Could it be the resin blend or have I started doing something wrong?
Any ideas on if I can salvage the parts with a solvent wipe or something similar?
Hello
If it is polyester resin it is supposed to stay tacky so your next layer will bond chemically to it. Polyester comes un-waxed and waxed. Un-waxed will not cure to the surface. Waxed will cure dry to the touch. Its oxygen that that will not let the resin cure to the surface. If waxed (also called air dry) the wax will comes to the surface and provides a barrier to the oxygen in our atmosphere and will allow the resin to cure right to the surface. If your resin is brown it is getting stale but I have found putting more hardener than normal will still get it to kick. Use lots of heat as well.
Fred
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sticky finish
FLD
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10 Years Ago
Answered my own problem, they are bin-bound due to a batch of resin.
FLD
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10 Years Ago
Yeh had a similar issue recently, the manufacturer messed up the addition of promoter. I could get...
Hanaldo
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10 Years Ago
Blimey, mine wasn't that bad. It cured but had a sticky surface and a strange rubbery layer that you...
FLD
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10 Years Ago
Yeh sounds like a similar case to mine. Mine did mostly cure, but it had patches that were uncured....
Hanaldo
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10 Years Ago
Nice save! I have a soft mould too. Forgot about that one. :rolleyes:
FLD
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10 Years Ago
[quote][b]FLD (09/12/2015)[/b][hr] I make a few parts in cheapo GRP. I have no shame!! I've made...
fgayford
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10 Years Ago
Thanks Fred :)
FLD
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10 Years Ago
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