The pre-primed quarter round need not be primed before painting. Two coats of durable paint will do, but if the wood is stained and unpainted, the quarter round should be primed. Any solvent-based primer is suitable for primer stained quarter round trim.
Product Details
Product namePrimed Pine FJ Quarter Round Moulding
http://www.hzsoulwood.com/prim....ed-moulding/quarter-