Agreed are you thinning your paints? If not I know that can cause some lumpiness form time to time or as well as not shaking your paint up go enough.
As for thinning paints a 50/50 mix of Future floor wax and water in your paints works quite nicely Thin paints cover better and dry faster than thicker paints.
Also if your paints are old and have that dried caked paint in the pot that can cause lumps as well
As for thinning paints a 50/50 mix of Future floor wax and water in your paints works quite nicely Thin paints cover better and dry faster than thicker paints.
Also if your paints are old and have that dried caked paint in the pot that can cause lumps as well