Believe it or not, Armorall, the car stuff is recommended under the finish
coats. And the finish should be UV-blocking. Wish I could supply a source,
but it's just something afloat in my memory banks. Wait for confirmation.
The source is probably Micahel Fortune, a prominent Canadian furniture
maker. In one of his demos or classes at a woodworking show he was
showing slides of his work. There were several slides of a piece with
a lot of purple heart. Someone noted that it browns out with exposure
to sunlight and asked how he planned on prventing that from happening.
"Armoral." Seems even a thin layer provides a great deal of UV
blocking - works on vinyl dashboards and they get a lot of exposure
Does that ring any bells.
IME, it's UV that makes it *purple* -- brown when first cut, purple on
exposure to sunlight.
Doug Miller (alphageek-at-milmac-dot-com)
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now not all purpleheart turns brown when you cut it. the wood I get just turns a
lighter purple. I notice the wood that turns brown is a more open pored wood and
not as dense. So far I have not found any of my purpleheart brown. but that
could mean it has not sat around long enough. I will test it.
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I use a product called Fabulon Pryme to block UV darkening, but I haven't
had trouble with purpleheart turning brown like I have with osage orange or
padauk. Pryme won't prevent darkening -- it just delays it. harrym
I thought Jeff Gorman's site had a discussion on the effect of sun on
different woods, but I can't seem to find it.
FWIW, here is my recent experience. I built a bookcase for the LOML's
office this winter out of purpleheart & poplar. After doing some
research, I finished it with exterior Varathane water based
UV-protected poly. (Sorry Larry) The bookcase is still purple, with no
discernible browning. It is not subjected to much light.
Some scraps ended up in my solarium. The top parts of the scrap
pieces, which were exposed to light, have turned brown, while the
bottom is still purple, although not as bright as the bookcase in the
After planing, cutting and sanding it, the purpleheart was brownish,
but it turned purple in a few days.
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