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leatrice gulbra 02-03-2012 10:19 AM

smoothing out old gooey semi gloss paint
 
i restore old furniture and sometimes the old semi gloss paint is gooey and just rolls up under the sandpaper . i do not want to strip off the paint . just smooth it . but it leaves dipped down spaces and looks terrible ! can anybody help?

ric knows paint 02-03-2012 11:06 AM

Quote:

Originally Posted by leatrice gulbra (Post 843140)
i restore old furniture and sometimes the old semi gloss paint is gooey and just rolls up under the sandpaper . i do not want to strip off the paint . just smooth it . but it leaves dipped down spaces and looks terrible ! can anybody help?

hmm...

Hiya Leatrice,

Couple of things -

(1) make sure your surface is clean before sanding. If these semi-gloss finishes have multiple coats of wax etc...that may be the cause of your project turning "gooey".

(2) If these semi-gloss finishes are latex, that also may be the problem. Most conventional latex paints soften with heat, and a lot of heat is generated when sanding - thus the gooey-ness. Latex paints really don't sand or buff out very well. If this is the case, try this - look for a premium grade finishing paper that is either a no-fil, or low-fil abrasive. This'll work better with latex finishes - and if you're not removing the finish (just trying to smooth things out a bit), do not try to accomplish this with just one grit or just a few passes. Start, lightly, with a medium grit, then to fine, then extra-fine (synthetic steel wool may help also)...see if that doesn't help - and, finally

(3) you didn't mention if you're hand sanding or machine sanding, but hand sand only. If you're sanding enough to create depressions in the wood, you're sanding too much, or too hard, or using the wrong grit, or all the above.

Good luck, I hope this helps

jsheridan 02-03-2012 11:47 AM

Good points ric, and thanks for stealing my thunder, lol. Latex is difficult to sand. I think 3M's green paper is no-fil, I know it's designed for latex paints. If you're dealing with a lot of flat surfaces, a lighter paper, maybe 120 on a palm sander might help, but you have to keep it moving constantly to avoid heat build up. If you get gum up globs on the paper when using a palm, turn it over while it's running and slide a putty knife under them and they pop off. Ric, I think the depressions she's talking about are from the melting and pulling away that leaves fine irregualar score markings in the finish. I've seen this, and felt it, when sanding latex on trim, where it's not that critical. On a piece of furniture it would be.

user1007 02-03-2012 03:08 PM

Acrylics are, at the end of the day, plastic polymers. When you power sand them you melt them into goo. As mentioned, if they have been waxed? You have polymer and wax goo. From similar experience, you have to strip or coat over the top. Sorry.


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