On Oct 6, 9:45*am, "dadiOH" wrote:
ransley wrote:
Spar or Marine rated is the only thing that will hold up against UV
rays and take the expansion -contraction that happens outside, for
doors its the best. I have jobs that 20 yrs later P&L marine is fine,
a door in winter can go from 0f-70f when the sun hits it in winter in
an hour, expanding the door measurably.

Yes, a "marine" spar varnish would be good for that application since
hardness can be sacrificed for flexibility. *If you're getting 20 years
though, you are lucky. *Very lucky. *I used to have a sailboat with a yard
(horizontal spar), always finished with a high grade "marine spar" alkyd
varnish. *The top of the spar was good for maybe 6 months in tropical sun.

AFAIK, spar varnish need not have UV inhibitors. *Not likely since it is
generally used in an environment that needs to have UV filtered. *When a
manufacturer tosses in the word "marine" it is generally to indicate that a
UV filtering material has been added. *Given the propensity of manufacturers
toward puffery, it is always a good idea to check the label for the actual
contents.

--

dadiOH
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I ued to use P&L the stuff that cost $70 a gallon in the early 80s,
alot of churches and school doors. On boats I worked on life was
maybe 2-3 years since it is a harsher invironment with near full day
sun and constant flexing. McClosky and others only lasted me 5-10
years. Do you apply it in sun or a hot surface by chance, I know on a
boat its hard to get proper shade to varnish, even sun to soon after
is hard on it. I would have though by now chemistry would have
improved upon P&L marine.