Are used oxalic acid on some interior trim on a 1959 morris minor traveler. I found that after removing the oxidized areas not only in the grain but around old screws etc. after a few months they came back. This has happened to me before on other projects. In this case I top coated with oil based polyurethane. I have all wood to do on the outside and itís way worse but I donít want it coming back after putting a lot of work into cleaning it up. I even sealed all sides of those trim pieces but it was maddening to see it create back. Any thoughts?
As my post said, yes I did see you all sides. Typical sanding process starting with 120 to 180. Iím not sure what my solution was probably a little less than saturation point.
I know the stains on the exterior will go way deeper into the word because itís Ash. If I were smart I would just replace the wood but Iím not.
It is weird they came back. I have never in my 37 years of doing this have that happen.
There must have been enough moisture left to keep the oxidation process going.? I would use a finish that will "lock up" the wood better. I would use a Exterior 2k urethane system with a Isolante on the bare wood first. Lots of good systems out there.
Hi Bob. Yeah, I just wanted to go old-school with the interior. On the outside Iím going to use my profane 4800 2K polyurethane made by pro line which is sure when Williams. Itís what I use on all my exterior front doors that Iím doing now. It just makes me nervous to think that if I do all this work to clean up this wood on the outside that it might come back to haunt me! I donít need that. Years ago I stripped an entire home full of cabinets and beams that were distressed red oak stained brown and I bleached and used oxalic acid on everything and then white washed it. About a year later I saw the job and the whole thing had turned gray! I think with all the stripping and washing the wood wasnít totally dry.
Yes the acid always works better when hot and wood is warm. A little sunlight does seem to help. To neutralize I like to overkill it.
First I do a clear water rinse, then a vinager/water mix rinse with a clear water re-rinse, then a sodium bicarb rinse with a clear water rinse to follow. This is all done back to back so the piece isn't soaking wet very long. I use a 25/75 mix of vinager/water 25% on the vinager. The sodium bicarb is a 3% solution. May be over kill ,but it has never failed me.
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