Hi,
I would say both are right. In theory if all amine blush is removed
followed by a careful sanding, gelcoat should adhere well to epoxy, but
sometimes it won't. Epoxy is stronger than polyester resin for both resistance
and adhesion.
As a general rule: epoxy over gelcoat is perfect, gelcoat over epoxy should be
avoided.
If you don't need the superior bonding of epoxy , polyester resin is just fine.
I know from experience, I re-did my whole deck with gelcoat ( after having
filled about 100 cracks and holes with epoxy ). In 2 areas the gelcoat
separated from the epoxy ( relatively large surfaces of epoxy, like 3-4 square
inches )
Sylvain
C&c27MkIII
________________________________
From: Steve Thomas <sthom...@sympatico.ca>
To: cnc-list@cnc-list.com
Sent: Monday, December 30, 2013 8:45 PM
Subject: Stus-List C&C (1990) gelcoat epoxy adhesion
All this talk about gelcoat matching has got me thinking about everyone's
seemingly universal preference for using epoxy (West
system in particular) for doing repairs. I am contemplating the purchase of a
boat that I know has a couple of soft deck issues,
and it seems to me that since this is an all too frequent repair, how does one
get the gelcoat to stick? I don't want to use
paint. Gelcoat manufacturers say don't do it. West says get rid of any amine
blush, do everything by the book with the epoxy, and
it should be ok. Anyone had problems with this, or is it just a bit of over
caution on the part of gelcoat manufacturers as West
claims?
Steve Thomas
C&C27 MKIII
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