I am starting to build some storage boxes out of exterior ply and
trimming it out in redwood. They will be fitted on our utility trailer
so they will be exposed to all the elements. I will more than likely be
spraying the finish on. I was just curious which finish will be a
harder more durable finish for exterior use. Any suggestions? Thanks in
A good spar varnish never really gets hard.
That is why is is used on wooden spars that tend to flex when placed
under load by the sails while sailing.
For most other applications, true spar varnish is a total PITA.
Basic reason I suggested epoxy high build primer is that it will seal
the plywood and prepare the surface to receive any number of finishes.
The lowest cost one being enamel.
Just guessing, but can't think of any reason to finish exterior plywood
bright (clear varnish). Especially if a structrual garde has been used.
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