This grit will smooth out the surface really apply two coats of primer.
Should You Sand Between Coats Of Paint On Walls. You do need to sand between coats of varnish. It was developed to be flexible enough to paint on plastic, and it has a bit of retarder in it which helps it remain glossy under less ideal application climates.
How To Prepare Exterior Walls For Painting - Eco Paint, Inc. from www.paintingdenver.net
I sanded, applied 2 coats of dulux trade undercoat and have applied one coat of dulux trade high gloss (no thinning of paints was done). Smoothing the surface, so the next coat will you should be able to apply two top coats w/o sanding, but hitting it w/ higher grit again won't hurt you may have been melting the primer from friction and that caused the balls of paint on the paper. After the final coat of flat paint, sand lightly with super fine sandpaper.
Most finishes don't require sanding in between coats unless you wait over two hours, or some time limit, before applying the next coat.
I do custom painting projects, guitar painting, airbrushing, spray can painting, wood. Those spot will then have three coats of paint on them and you'll have a nice, even finish coat. The undercoat won't stick to the wall if it is dirty. If you are painting the second coat as soon as the first coat is dry then you don't need to bother.
