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cleaning old finish4/12
Building new cabs to go with excisting painted oak cabs. Customer wants all painted to match. after checking old cabs they are filthy. Whats best way to clean 5 part panels to refinish?
It's not high tech, but it's always worked:
Wipe everything down with a rag dipped in naphtha - it removes all the oil based dirt.
Then wipe all surfaces down with rag dipped in solution of 1 gallon of water and 2 capfuls of Dawn dishwashing soap. This removes any waterbase dirt and any remnants of oil base dirt.
I've tried using ammonia instead of the water solution but it's rough on the skin and eyes.
Sometimes an original coating is so degraded it requires a complete stripping.
Its not one of the cleanest jobs a finisher can perform but in most cases it guarantees that the new finish will perform at its best.
Lots of chemical strippers to choose from. Regardless of which one you decide on be sure to follow the instructions. You can run into problems if all the old finish isn't thoroughly removed.
If you decide to remove the existing coating with a stripper, be sure to clean and rinse all the stripping remnants (wax)as they will interfere with drying and adhesion of your new coating.
Prior to jumping into a complete finish removal, follow the advice that Bob posted. Once you have gone through those steps...apply your new coating to the test piece. If it dries properly and you have no wet spots or fish eye's or craters, you might be OK with applying the new finish over the old.
I like using TSP. It seems to take off all of the old grease and furniture polish. You get it in the paint isle at home depot. TSP stands for Tri sodium phosphate.