Spraying sealant can be fraught with peril! Here are some tools that can help you get a good result by helping you eliminate lint and get an even coating.
Just before spraying, I whisk the face gently with a soft fan shaped paint brush. The light touch gets rid of tiny fibers and doesn’t mess up my pastels. I follow with a quick blast from a can of compressed air. Don’t get the can too close though!!!! You’ll get a spot of ice on the surface.
I use a cheap lazy-susan to spin the head as I spray. This has really helped me get an even coating. Many people just hold the head at arm’s length. I can see what I’m doing much better with the lazy-susan. I also use little bathroom sized Dixie cups to hold the heads. Squish them a little and push them inside the head cavity. You can reuse the cup until it falls apart.
And always wear a respirator when spraying — even outdoors!! Hey, it gives the neighbors something to talk about.