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Liquid Sandpaper

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Liquid Sandpaper Liquid_Sandpaper, or Liquid Deglosser can save you many hours of hard labor using sandpaper

Glossy Painted Surface Needs Roughing

A glossy existing painted surface that needs repainting must be prepared before the new paint will stick properly and give a good new paint job that will last a long time.

Sandpaper will rough up a glossy surface and give it "tooth" to hold new paint, but you don't want to use a very coarse sandpaper or you'll get little grooves in your finished paint job. Liquid sandpaper deglosser won't do that.

Sandpaper will give you some sore muscles too, because it's very labor intensive and very exacting. It's necessary to prepare every little speck of a glossy surface to be repainted or the new paint won't stick.
A quick swipe with the sandpaper won't do the trick. All little nooks and crannies, moldings and carvings need to be sanded.

Clean all surfaces to be repainted

Let's get the horse back up in front of the cart. Before you start sanding it's necessary to do some very thorough cleaning to remove any airborne contaminants, such as comes from cooking, even in well ventilated homes.

It's good to start with a good furniture cleaner designed to clean surfaces from those that you know are already clean to those that are obviously in need of cleaning.

Paint won't stick to even a small speck of greasy, oily or waxy surface. It will just bead up like water on a well waxed car.

Liquid Sandpaper deglosser to the rescue

After everything is clean you can go to work with the liquid sandpaper deglosser. Purists will shake their heads and say that you have to use sandpaper, but experience tells me that no matter how careful you are, unless you have a perfectly flat surface, you're going to have at least one little spot that you'll have to redo, because paint won't stick.

You can use a cloth rag or paper towels to apply the liquid sandpaper and use a clean paint brush (cheapy chip brush will work well) to daub into nooks, crannies, crevices and other tight places and clean it out with some paper towel. Any guck that is obstinate and wants to stay in a crack, crevice or corner can be picked out with a toothpick or a dowel sharpened in a pencil sharpener. Best not to use a nut pick or other metal tool, as they can remove wood too.

Tri Sodium Phosphate (TSP) isn't a good alternative

TSP is a good cleaner, but the kind of cleaning you need for repainting, TSP can soften old paint a little too much. Liquid sandpaper will soften paint too, but not to the extent that TSP will. With light coats of paint TSP can be used as a paint remover. Generally paint will harden enough after being softened with liquid sandpaper to where you can have a nice solid paint application. Old paint that hasn't hardened enough after a TSP cleaning will cause the new paint coat to always be a little soft and easily marred. TSP is very very hard on your skin.

Be kind to yourself

Always use good safe practices. Use eye protection, skin protection with non-alergenic (to just about everybody) Nitrile Industrial Gloves. Good ventilation is an absolute must. You should discard waste rags, paper towels, residue and anything else to be thrown away that has to do with furniture and chemicals in a metal waste container with a metal lid. Most of the discarded items can catch fire by spontaneous combustion. - Online Art Supplies
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