I can get my stair parts for around 300 quid, or 350 pre-primed. I thought, oh good I just need to gloss them, but the website says, "pre-primed, just need undercoat and top coat". So for 50 quid I am getting priming (and I guess knotting solution). I have always just used undercoat without any problems, so what is the priming actually for ? Is it worth paying extra 50 quid to save the priming stage ? Does oil-based undercoat need a separate primer ?
Thanks, Simon.