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post #8 of Old 01-15-2009
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Some epoxies don't blush or have a much reduced blush, like MAS epoxies...Or you can choose to lay up while the first layer is still tacky, before it cures fully.

The main reason most people go with Epoxy resins is because Epoxy resins have much better secondary (adhesive) bonding characteristics than do vinylester and polyester resins. Polyester and vinylester resins are much weaker when they can't form primary (chemical) bonds and have to rely on secondary (adhesive) bonding.

Two things to be aware of. First, epoxy resins deform and weaken at much lower temperatures than do vinylester and polyester resins, so you need to paint or gelcoat epoxy resin work in fairly light colors if the work is exterior. Second, epoxy resins are also subject to UV-degradation, so they need to be coated with something to protect them—paint or gelcoat.

Originally Posted by dgr View Post
Thanks for that. So, what are the options to avoiding amine blush and insuring the highest bond strength between layers? Or can I go polyester or vinylester and just wax the last layup. It seems to me that everyone that does this type of work is using epoxy but I'm open to whatever will achieve the desired end result.


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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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