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Forum topic by mski posted 09-01-2008 04:06 AM 1058 views 0 times favorited 5 replies Add to Favorites Watch
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mski

442 posts in 4903 days


09-01-2008 04:06 AM

Hi All,
I was thinking if I mixed my own Oil Varnish Wax Finish and using Outdoor Varnish , (Spar Varnish or Outdoor Poly), would it help control UV from fading or darkening wood like Paduk or Purpleheart?
I do not need protection fom the elements, just UV.

Thanks

-- MARK IN BOB, So. CAL


5 replies so far

View Douglas Bordner's profile

Douglas Bordner

4073 posts in 4987 days


#1 posted 09-01-2008 06:16 PM

This is only gossip-mongering, as I have never tried it, but I have heard that a final treatment with Armor-All helps keep the padauk red. I haven’t tried it because I am leery of having silicon containing chemicals in the shop (fear of fish-eye). Surely the addition of Spar will help some.

-- "Bordnerizing" perfectly good lumber for over two decades.

View Joey's profile

Joey

276 posts in 4739 days


#2 posted 09-01-2008 07:41 PM

it might help for a while. spar urethane builds thicker and it has uv blockers in it. What was your mix with BLO, tung oil, or both? The best thing you can do to keep it from fading is not to expose it to sunlight. but all wood will change with time. Cherry and mahogany both darken, purple heart loses it’s purple color.

-- Joey, Magee, Ms http://woodnwaresms.com

View gerrym526's profile

gerrym526

293 posts in 4731 days


#3 posted 09-03-2008 10:20 PM

Since you talk about controlling UV, thought it would be interesting to share what I learned in Bob Flexner’s Finishing class a few years back.
Bob talked about how all wood finished with a clear stain or finish would have its fibers break down when exposed to UV. He mentioned that the only way to prevent the effects of UV on the cellulose in the wood is to cover it with a solid body stain (eg. outdoor stains you can’t see the wood through), or paint it.
Since you want the beauty of the grain to show in your piece rather than covering it up with solid stain, there’s no way to prevent the darkening effects of UV.

-- Gerry

View jcees's profile

jcees

1079 posts in 4722 days


#4 posted 09-03-2008 11:37 PM

Flexner is a no-bull finishing expert and is correct that wood exposed to UV will break down. Eventually. UV blockers are actually absorbers and as such if you insist on a clear coat then go for the best product you can afford. My humble shortlist for brands that render the best protection follows. They all have high solids content and you can literally feel it when you pick up the can.

Epihanes
Penofin
Sikkens
Interlux

I’ve used all of these and they’re as good as you’ll get.

always,
J.C.

-- When one tugs at a single thing in nature, he finds it attached to the rest of the world. -- John Muir

View mski's profile

mski

442 posts in 4903 days


#5 posted 09-05-2008 03:00 PM

Thanks all,
I’ll try Spar varnish,
I heard that gossip about Armor-All , but I’m also leery about the silicone .

-- MARK IN BOB, So. CAL

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