Originally Posted by heron237
what?, you varnish
over epoxy, what is this amateur hour, epoxy doesn't have a uv component, all gloss varnishes do.
For clear finishes:
The reason one would "varnish over epoxy", (Like the base under this windlass
that I installed a few years back), Is that the UV filters of the varnish will protect the epoxy from yellowing and eventually becoming brittle, from UV exposure. In this case I instructed the client that the varnish protective layer was essential, and must be maintained.
The epoxy, on the other hand, while lacking UV resistance, is a total vapor barrier, where as varnish is not. Varnish allows the wood to have a constantly changing moisture content, as it is not a water
vapor proof coating.
For maximum wood stability and coating longevity, Varnish OVER a 100% solids epoxy (like West), is the way to go... AS LONG as one is willing to ALWAYS scuff and re apply the varnish regularly, to maintain a UV filter.
If not, they are better off with just varnish, and completely strip it once in a while, when they waited too long between re-coats...
Having said that... The problem with repeatedly stripping teak
trim and the like, is that after enough "strips", the bungs become so thin that they pop out. Then the only fix is to remove EVERY fastener and countersink the holes deeper, so that it can be re bunged. It's a pain!
I avoid clear finishes on my own boat like the plague, but I suggest to my clients that IF they have and like varnished teak
, they maintain it BEFORE it starts to fail, rather than let it fail, strip it, and re varnish, over and over, for the life of the boat.