Do I need to prime MDF before painting ?

[Talay]

Cellar conversion completed or thereabouts and I want to get the paint ordered. I just wonder whether I really need to use a primer or not ? Walls are 12mm MDF with seams covered.

Probably using either http://www.diy.com/nav/decor/paint/...-Luxurious-Silk-Paint-Sweet-Pink-2-5L-9191143

or the Trade Diamond Eggshell http://dulux.trade-decorating.co.uk/products/info/dulux_trade_diamond_eggshell.jsp

 

[dcdec]

Firstly dont use B&Q paint its crap. Use a good quality trade emulsion from Crown, Johnstones, Dulux etc. Most mdf is factory primed so you can go straight on with an u/c, if you're not sure go with a WB primer undercoat times two and finish with top coat

 

[Robbie uk]

dcdec spot on. If you use an oil based gloss then it will soak in and will need lots of coats. Use a water based primer/undecoat and give a gentle rub down after before applying your chosen top coat