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painting over tar?

 
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Wm Watt
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PostPosted: Wed Nov 14, 2007 12:53 am    Post subject: painting over tar? Reply with quote
Any suggestions on painting over tar?

It's old thin tar or bitumen on wood. In places it's soaked into the
wood and dried out. Elsewhere there's been repairs with more recent
tar more generously applied. I've scraped it down to wood but it's
still tacky. When I rest my weight on my palm while working here it
comes away with some tar residue which have to use solvent to clean
off.

Is there a hardener or sealant I should use or can I paint right over
tar? I don't think I want to use oil paint as the tar would likely
bleed through. But water based latex paint should not mix with the
tar.

Thanks for any adivce.
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Guest
PostPosted: Wed Nov 14, 2007 2:22 am    Post subject: Re: painting over tar? Reply with quote
On Nov 13, 1:53 pm, Wm Watt <ag38...@fastmail.fm> wrote:
Quote:
Any suggestions on painting over tar?

It's old thin tar or bitumen on wood. In places it's soaked into the
wood and dried out. Elsewhere there's been repairs with more recent
tar more generously applied. I've scraped it down to wood but it's
still tacky. When I rest my weight on my palm while working here it
comes away with some tar residue which have to use solvent to clean
off.

Is there a hardener or sealant I should use or can I paint right over
tar? I don't think I want to use oil paint as the tar would likely
bleed through. But water based latex paint should not mix with the
tar.

Thanks for any adivce.

I would let it become part of the tar and use oil based primer, and
then paint as usual. Treat it as if it was wood, just my opinion. I
had a car once that had chickenwire cardboard, and tar for a fender;)
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Brian Whatcott
Guest
PostPosted: Wed Nov 14, 2007 2:22 am    Post subject: Re: painting over tar? Reply with quote
On Tue, 13 Nov 2007 10:53:10 -0800, Wm Watt <ag384fm@fastmail.fm>
wrote:

Quote:
Any suggestions on painting over tar?

It's old thin tar or bitumen on wood. In places it's soaked into the
wood and dried out. Elsewhere there's been repairs with more recent
tar more generously applied. I've scraped it down to wood but it's
still tacky. When I rest my weight on my palm while working here it
comes away with some tar residue which have to use solvent to clean
off.

Is there a hardener or sealant I should use or can I paint right over
tar? I don't think I want to use oil paint as the tar would likely
bleed through. But water based latex paint should not mix with the
tar.

Thanks for any adivce.

This is a problem as much for woods that exude pitch or resin, as with
those where pitch was applied later.
Here's one approach: - with the wood really hot
(maybe blowtorched with care? )
scrape the ooze.
Then sandpaper.the surface.
Then scrub with alcohol etc.
Wait and repeat.

Brian Whatcott Altus OK
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