I have a few joints in my toe rail where the wood meets wood and my varnish over a year or two gets moisture under it and lifts and spreads at the joint. Now I have to remove the bad area and build up the varnish again or remove all of it and do the entire rail. Here is one thing I will admit, I never thin my first coat on raw wood. I like to build it up ASAP. It holds well everywhere else but the joints. What could I do to help remedy this problem? My varnish is One part Epifanes varnish gloss clear.