How To Use Tsp Before Painting Exterior?


Trisodium phosphate (TSP) is often used both to clean the walls and to de-gloss existing paint. Use eye protection and mix TSP with water; it’s a powerful chemical. Also, work from the top of the wall down and rinse off cleaners and chemicals.


TSP cleaner is commonly used to clean walls and other surfaces before painting. When doing so, you must mix the TSP with water. Rinse everything thoroughly after using the TSP cleaner and then give ample drying time before painting. It can be a replacement for sandpaper as well since TSP cleaner will remove paint.

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Frequently Asked Questions

Do you have to wash off TSP before painting?

Always be sure to completely rinse TSP from the walls (and let the walls dry) before you paint; otherwise, the new paint won't adhere properly. Rinse the solution with a clean, damp sponge and you should end up with a beautiful paint job.

How soon can you paint after TSP?

Through a combination of my lack of experience with TSP and very inadequate instructions on the box, I let TSP dry on the walls for around 30-60 minutes before rinsing the walls with water.

Do you have to repaint after using TSP?

Pros of Cleaning with TSP Suitability for exterior surfaces: TSP works well—and without damage—on a variety of surfaces, including brick and stone, cement, wood, and roofing. If the surface is previously painted, you should expect to repaint after cleaning with TSP (see next).

How do you clean walls with TSP before painting?

Mix the TSP powder into hot water until no more will dissolve. Swab it on the wall, and sponge it dry. Rinse with clear water, then sponge dry again. Similarly, you may ask, do I need to wash walls with TSP before painting?

What's the best way to use TSP cleaner?

It’s best on outdoor surfaces, although it can be used indoors, too. In that case, mask all other areas you're not cleaning, and do not use it on metal, glass, or wood, as it can cause damage. Rinse the surface thoroughly with clean water after use and leave to dry.

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