I am using ppg NCP280 primer on my project. If I apply the primer but wait a week or two to sand it, and perhaps another couple weeks before adding a color top coat. Do I
need to add a sealer on top of the primer before my color coat?
Sealers still confuse me as whether or when they are necessary. Are they just a very reduced primer? Do they go on really thin and leave a nice smooth surface finish before color top coat? Since color is applied right after a sealer I would imagine that it must go down smooth to not require any sanding before the color. Is this correct how they work.