How do I clean thick primer out of a paint brush?
The results I get for that product name indicate that it is oil based.
As such, water cleanup won't do.
You should (before painting, with a clean brush) dip your brush in paint thinner and wipe it out so that the deep parts of the brush are -pre-loaded with thinner rather than paint.
When done painting, you need to clean the brush with paint thinner, not water.
You can also use paint thinner to make the thick paint, thinner (better just the tray or cup you have out to paint from, not the whole bucket, and if you are painting from the whole bucket directly, stop doing that &amp; use a tray or cup...) but don't overdo that (there are typically directions on the side of the can/bucket for what range of thinning is acceptable.)