Below is a picture of a mahogany entry door I’m finishing with spar varnish. It has 4 coats on it. I’m spraying the product, lightly tipping it with a brush and then putting another very light coat immediately after tipping. I’ve sanded with 220 between each coat but can’t seem to get the grain to fill. The varnish has been thinned about 15%.
I finished an identical door a few months earlier the same way minus the tipping and had no problems filling the grain and getting a smooth surface.
Any ideas are welcome.