The goal of sanding wood that has primer on it is to smooth down the grain that has risen while still leaving the primer intact so you do not lose the added adhesion that the primer will provide for the top coat. If you have sanded through the primer in any areas creating color patches this could create issues with top coating.
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Does primer sealer need to be sanded. Then the primer is sanded and one coat of sealer is applied. To sand wood with primer on it you should consider a finer grit sandpaper like a 220 grit sand paper. Trying to use the primer as a sealer then the primered surface has to be all even with no sand through spots. The sealer is one more step one more introduction of solvent one more dose of texture orange peel painting over a sanded fully cured urethane primer of a similar color my favorite primer of all time is tintprime by s w provides the. Primer is the final undercoat product that is designed to be sanded and smoothed. Anything applied after them are simply used to seal based materials from absorbing paint solvents or to increase overall paint adhesion.
But on your car where you have high expectations apply the color right over 500 sanded urethane primer. The basecoat dries for one hour recoat window and two coats of urethane clearcoat is sprayed. The primer has to be sanded to promote adhesion for the top coat. The tech sheet for the sealer says it needs to dry for 30 minutes another recoat window and then one round of three coats of basecoat color can be sprayed. Primer is only intended to be sprayed on surfaces to fill very slight sand scratches or other tiny surface blemishes.
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