Chalk Painters - question!!!

Okay, so I love this stuff. Already did one bathroom with it and used wax to seal the first one. This time around I bought the matte sealer to use in an effort to reduce odor. My question is : Im an experienced real good painter, yet with this sealer I cannot for the life of me get rid of the streaks. I've tried small brush, medium brush, sponge brush...what am I doing wrong?? Has anyone used a sponge type roller on this before??? The cabinet doors are the real issue..the base itself is not an issue.
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