Posts Tagged ‘chemical’

Paint Must Be De-Glossed Before Adding A New Coat On Top

September 29, 2020


The original paint in both these photos was a gloss or semi-gloss. When it came time to update, someone applied a coat of new paint right on top. Then the floor guys came and stained the floor. To protect the new paint, they applied painter’s tape. Unfortunately, when the tape was removed, it took some of the new paint along with it.

Believe it or not, even something as relatively gentle as wiping wallpaper paste off the woodwork is enough to cause poorly-adhered paint to delaminate.

This happens because the new coat of paint was not given a sound surface to grab ahold of and adhere to.

To have properly prepared the original gloss paint to accept the new coat of white paint, the painter should have done one or more of the below:

1.) Sanded the paint to knock off the gloss. This leaves dust residue, so that dust will need to be wiped off with a damp rag or sponge (rinsed clean frequently) or a Tack Cloth.

2.) Wiped down with liquid chemical deglosser, such as Liquid Sandpaper.

3.) Primed with a bonding primer, formulated to stick to glossy surfaces, and also formulated to serve as an appropriate base for the new paint.

A primer is also not a bad idea to follow up in the case of 1.) and 2.) above.

Yes, all of this is a whole lot of work, and it creates dust and/or odors, takes more time, and adds cost.

But it’s a step well worth the investment, because properly prepped and painted surfaces will hold up and look professional for decades to come.