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Model Forum / Radio Controlled / Air Models / November 2006Resin ??'s.. Epoxy over Polyester or Polyester over Epoxy?
Need to do some resin work in the very near future and the project I'm working on has been resined before. I forgot if you can do epoxy over polyester or polyester over epoxy. If memory serves, the 1st resin job was epoxy, but am not 100% sure so I'd rather re-resin with the stuff that'll stick to either epoxy or polyester.. a lil' help please! > Need to do some resin work in the very near future and the project I'm > working on has been resined before. I forgot if you can do epoxy over [quoted text clipped - 5 lines] > > a lil' help please! http://www.azom.com/details.asp?ArticleID=1161  SignatureTim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ >http://www.azom.com/details.asp?ArticleID=1161 Looks like Epoxy is the way to go.. Thx Tim! > Need to do some resin work in the very near future and the project I'm > working on has been resined before. I forgot if you can do epoxy over > polyester or polyester over epoxy. Epoxy over polyester! For some reason Polyester resin doesn't cure when used over Epoxy resin. On the other hand, Polyester resin doesn't bond very well to Epoxy and may delaminate later on. It's best to use what ya used before. However, you can coat Epoxy with a thin layer of 5-Minute Epoxy and Polyester sets up fine. 5-Minute Epoxy doesn't seem to inhibite the curing the way regular epoxy does. >For some reason Polyester resin doesn't cure when used over Epoxy >resin. On the other hand, Polyester resin doesn't bond very well to >Epoxy and may delaminate later on. It's best to use what ya used >before. However, you can coat Epoxy with a thin layer of 5-Minute Epoxy >and Polyester sets up fine. 5-Minute Epoxy doesn't seem to inhibite the >curing the way regular epoxy does. Don't know what I used before - it was over 20 years ago.. In any case the Epoxy resin I used cured up just fine and there doesn't seem to be any adhesion problems - at least none that a couple hours of sanding could have turned up. >For some reason Polyester resin doesn't cure when used over Epoxy >resin. On the other hand, Polyester resin doesn't bond very well to >Epoxy and may delaminate later on. It's best to use what ya used >before. However, you can coat Epoxy with a thin layer of 5-Minute Epoxy >and Polyester sets up fine. 5-Minute Epoxy doesn't seem to inhibite the >curing the way regular epoxy does. That's the way i recall it, Ace. Another solution I recall from the lore is to take a swipe of CA over the polyester (or unknown) resin, then epoxy will adhere and cure. Abel epoxy over polyester. Polyester eats epoxy so you can't go that direction. > Need to do some resin work in the very near future and the project I'm > working on has been resined before. I forgot if you can do epoxy over [quoted text clipped - 5 lines] > > a lil' help please! |
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