[finishesbykevyn]

After this long winded thread, I decided to use the stix hybrid primer. Sprayed and back rolled it with a wizz roller. Amazing stuff. Buffed it all down with a sponge and sprayed 2 more coats of dulux latex semi-gloss. No problems at all. However i would normally use a higher quality top coat, but the GC bought all the paint..will post some pics.

 

[capepainter]

A contractor we work for uses tons of mdf and the only primer we,ve ever and only use is bin a minium of 2 coats sanding in between. Never had a problem builtins cabinets ect

 

[JRSL Interiors]

I think it is perfectly good to use a water based primer so long as its quick drying. This will minimise the Mdf swelling. But oil based primers are always give a better finish - Mdf included!

 

[Xmark]

a good bonding/sealing acrylic primer is OK. you might want to seal the ends and raw parts with coverstain or Bin.