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well funny you mention this. had some doors to do recently. doug firs with marine spar varnish. all exposed to mega sun all day. marine spar varnish reacts with uv's and in 6-9 months starts to onion peel.
we went with 3 coats of acrylic clear coat. water based does not react with uv's. oil based DOES react w/uv's. as per our local dunn edwardo's.
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