What would cause new paint or primer to put little clumps of paint on the walls with a brush or roller?

Hello, I've never experienced this problem when painting. Whether I use a new roller or brush little flexs of thickened paint show up on the wall. Both the paint and primer are new as well. I have to roll it on, then wipe it partially off with a cloth, and then roll it again to get a smoothe finish. I've used the brands of paint and primer without any problems previously.


Your suggestions are appreciated.What would cause new paint or primer to put little clumps of paint on the walls with a brush or roller?
Strain the paint thru an old pair of nylons. Is sounds like the pigment was not mixed well causing the clumps. Or the paint itself is old.What would cause new paint or primer to put little clumps of paint on the walls with a brush or roller?
Don't know if this is your problem or not, but we had clumps of paint on our walls after we use a PLASTIC roller pan. The paint would start drying on the plastic from loading the roller and because it didn't stick to plastic, the next load would pick up dried flicks of paint.





We never have had a problem with this when we use metal roller pans. It solved our problem!
i always screen any paint by pouring it thru a strainer that you can buy at your paint store. but first i mix it with a paint mixing blade on a cordless drill to blend any pigment that is on the bottom of the can. also, the pro's will wrap new roller covers with painters masking tape from one end of the roller cover to the other, do this in a spiral overlapping wrap, to pull off any loose lint or fibers from it. if you still have problems with the paint lumping, either return it to where you got it, or thin it with the proper solvent or thinner listed on the side of the can. start small, you can always add more, but you can't take it back out. good luck, hope this helps.