Poly Over Exterior Semi-Trans. Stain?

Finishes, paints and coatings

Poly Over Exterior Semi-Trans. Stain?

Postby Danidog » Mon Nov 03, 2014 6:01 am

I have an oil based semi-transparent stain on my TTT siding. Would it be a good idea to seal that with maybe some Helmsman Spar poly for more protection? My paint store guy says "I dunno" :thinking:

thanks,

Dan
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Re: Poly Over Exterior Semi-Trans. Stain?

Postby 48Rob » Mon Nov 03, 2014 6:17 am

I use oil based poly over oil based stain all the time.
It has been done for years.

You can put oil, or water based finish over oil stain.
What you don't want to do is put oil over water based.
Oil dries hard and does not stretch.
Water based/latex stretches/moves, hard non stretch oil over soft stretchy latex will fail.

As to your question about "should I protect it" yes, it would be a good idea as stain does not seal the wood from moisture damage.

Rob

PS. You need to get a new paint store guy that has a clue.
Paint stores sell products that are designed to seal and protect multiple surfaces, inside and out.
If he can't answer that simple question, he isn't to be trusted to give advice on what kind of paint his customers need.
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...

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Re: Poly Over Exterior Semi-Trans. Stain?

Postby Danidog » Mon Nov 03, 2014 11:41 am

Thanks Rob.

This is the first BM paint store I've seen where the owner's family doesn't seem to care.
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Re: Poly Over Exterior Semi-Trans. Stain?

Postby Tom Kurth » Mon Nov 03, 2014 6:09 pm

A long-time interior finish guy told me you could put poly a lot of stuff but make sure it doesn't have stearates in it. That's the stuff they add to sanding sealers so they don't gum up your sandpaper.

Best,
Tom
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Re: Poly Over Exterior Semi-Trans. Stain?

Postby mrwall1 » Mon Nov 03, 2014 7:00 pm

Poly would be a good choice... I am surprised B.M. didn't know.... they sell a really good Acrylic Poly... Benwood Stays Clear.....
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