Sandblasting to remove old finish????

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Forum topic by Hopdevil posted 11-13-2017 03:14 AM 602 views 0 times favorited 4 replies Add to Favorites Watch
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223 posts in 3694 days

11-13-2017 03:14 AM

I made two Adirondack chairs for my son and his wife out of sapele. I used 3 coats of penetrating epoxy followed by 2 coats of marine varnish. Unfortunately the winds up in the Rockies actually threw them across his deck and scratched and banged them up pretty good.
Sanding them would be tough to say the least. Has anyone ever tried sandblasting a tough finish like that? Someone said you can ‘sandblast’ with polymers or something which would be less damaging to the wood but they didn’t have any other info.
Any thoughts would be appreciated.

-- Buzz ---- Of all the things I have ever lost, I miss my mind the most.

4 replies so far

View MrRon's profile


5812 posts in 3852 days

#1 posted 11-15-2017 05:18 PM

You might try sand blasting with walnut shells or use a soda blaster.

View HTown's profile


114 posts in 1795 days

#2 posted 11-16-2017 03:43 AM

I was sand blasting some louvres and had them laying over a 2×4. The board was also blasted. An odd texture was created as the harder part of the grain didn’t wear as much as the softer portions.
I’m not sure if your chairs would do the same.

View Kelly's profile


2637 posts in 3552 days

#3 posted 11-16-2017 03:53 PM

Ditto on HTown’s experience. Many of us used to blast [with sand] for the raised grain effect on signs and such. It would be less or no problem with walnut and soda, but I don’t know how they’d do up against the epoxy.

Is there a chance you can fill the scratches with epoxy, sand it flush, then apply another top coat?

View Kazooman's profile


1411 posts in 2561 days

#4 posted 11-16-2017 04:03 PM

Another ditto on the raised grain issue, in a related context. I pressure washed an outdoor redwood bench prior to remove surface dirt and some mildew applying a new coat of marine spar varnish. I sure won’t do that again! Even with a wide spray nozzle and keeping back from the bench the softer area of the grain were chewed up leaving nice ridges of the hard grain. I would imagine that sand blasting with sort of abrasive would do the same thing.

Sapele might stand up better than softer woods. Try on an an unexposed area like underneath the seat and see how it goes.

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