To blend the sanded surface back into the rest of the spa almost seamlessly, use only Methyl Ethyl Ketone (MEK). MEK is the only material that you can mix with Centrex and get it to break down without affecting its color, as long as it is used in a well ventilated area.

The most effective method for bringing the texture back to a Centrex spa surface is to put a small amount of MEK in a metal or ceramic cup (not plastic), dipping in a paint brush and carefully use the brush to dampen the damaged surface of the Centrex. Then simply press on the bristles, leaving a dimpled impression on the softened spa shell. If the texture is too deep, simply sand some off and re-texture if necessary. Dip the paint brush so that it’s just moist, not dripping. This method is essentially stamping the material as soon as the MEK has softened it.

A textured sponge can also be used to create the imprint. After the MEK is applied, gently press on the affected area until the desired texture is achieved. Start from the outside of the repair and slowly work your way in.

Let stand to cure (up to 4 hours) DO NOT SAND.