You didn't say what make of boat you're working on. I had two Chris
Craft cruisers back when "woodies" were still around. I used
Dolphonite walnut filler stain for the most part. It became hard to
find Chris Craft paint , stain & varnish, so had to try others.
Dolphonite came the closest to the original CC walnut that most CC
boats had. Pettit had good paint & varnish, too.