Just as a clarification on terminology(and in one of my above posts,I incorrectly used the word"stripping" when I should have used the word "removing")there is a difference between using a chemical paint stripper to attack and destroy a paint film,and using lacquer thinner to"wash off"old lacquer.All of the above posts that suggest using a stripper to remove lacquer(or paint of any type)will damage filler and leave a residue that might later migrate to the surface,causing future problems,are correct,based on my previous experience.This does not mean that you cannot use lacquer thinner to re-dissolve the old lacquer film and essentially wash it off,without attacking any 2-component materials underneath.This would include filler,which can be epoxy based,but is usually unsaturated polyester,either of which will have enough chemical resistance to lacquer thinner when properly catalyzed and sufficiently cured(as will epoxy and "2k" primer).However,as the above posts suggest,i would NOT use any type of "stripper" over filler for the above stated reasons.Avoid products that contain methylene chloride,dilimeolene,contain wax(to slow the evaporation rate)or say stripper on the label.If you decide to wash certain areas with lacquer thinner and hit a filled area,you may get some staining of the filler from the lacquer/solvent.Just make sure before you recoat it,you lightly sand and let it dry,the lacquer thinner WILL evaporate out of the filler if any is absorbed.If you use stripper,my suggestion(as others have said)would be to remove any filler that might absorb it.if you use lacquer thinner to remove the topcoat and it softens/lifts/wrinkles or attacks anything below,might as well keep washing,because that has to come off,too,for a sound substrate to apply a new paint to.good luck.
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