i am currently d n d'ing a house and skimming, all the plastering is to a really good finish as the customer is VERY fussy, he and i have noticed where the boards join along a wall there is hairline cracks on alot of the joints, i have used scrim and done everything as usual. i think two coats of paint will be enough to fill and hide them but i just wanted to know if other spreads experience this? all the ceilings are fine.