Thanks All,
what's the reason behind sanding after priming and painting before
your second coats? Does it give a better surface for the following
coat or something ? I'd fear sanding would show through the final coat
making it look porous. Especially with semigloss paint which reveals
almost everything. No ? Should post-sanding still apply since I'm
using semi-gloss oil ?

If so , what grits should be used ?