And three coats of marine varnish don't hurt either.
However, with the development of improved UV-absorbers and filters in the chemical composition of the various marine varnishes (spar varnish, polyurethane, or linear polyurethane), this work is not as intensive as it once was.
Q. Our wood garage door faces south and has been varnished several times with either a marine varnish or a polyurethane.
Automakers recommended that the wood framing and panels be sanded and refinished, or at least have a coat of marine varnish applied, every 6 to 12 months.
A marine or yacht varnish is recommended when a clear film is required that will not obliterate or mask the natural grain configuration of the wood.
Even top quality marine varnish is not as water resistant as paint so you must apply at least 4 coats minimum.
Spar varnish (also called marine varnish) was originally intended for use on ship or boat spars, to protect the timber from the effects of sea and weather.
Mr. Zsikla then wet-sanded in preparation for the final coat, a 50-50 mix of paint and high-gloss marine varnish.
If you inquire about "marine varnishes and paints" they'll right where to direct you.
The brightwork gleams so that I can nearly see my image in the marine varnish.