"Lobster" wrote in message
...
Vortex wrote:

I've just built some shelving using MDF and have just encountered some
kind of paint incompatibility the like of which I have never seen before.

Specifically I primed the shelving with Homebase own brand wood and metal
primer (oil based)....but when I try to apply a top coat the paint has
been repelled as if I am trying to paint wax!! On this occasion the top
coat is Farrow and Ball "Modern Emulsion"...which is water based and 'kin
expensive.

Pic he http://www.hernibles.com/paint_small.jpg

What really puzzles me is that the same paint combination on bare wood
just works with no problem at all.

I had just the same problem a few years ago when using Leyland acrylic (ie
water-based) gloss over an oil-based primer. Also on MDF, but it was just
the same problem where the substrate was timber.

I posted a similar "WTF?" plea for help here too, which you might be able
to locate(!) IIRC the advice was not to mix'n match oil- and water-based
paints, something which I've always made a point of adhering to since
then, and have not had a problem again.

Still don't understand why it should happen though, if the underlying coat
is fully dry.

David

The primer was applied 24 hours ago. BUT dried in a chilly garage
overnight, so not completely dry.

I'm just going to have to wait for the emulsion to dry and see how well it
has adhered. Have a hunch I'll have to sand it all down and start again.

I'm so disillusioned I think I'll go to the pub.

D