paint job epic fail

[darth]

Hi all, I have just recently started to repaint a wooden surround for my fire and I'm having a few issues with the top coat of paint, would be grateful of any advice.

The wooden surround is actually mdf, I abraded the surface to remove the shine and gave it a coat if zinnser 123 primer, I followed it up with two coats of dulux undercoat and finally one coat of fortress trade satin. The satin went on about 54 hours ago but it's still not cured. The paint has dried but still feels soft, I'm guessing the top coat is a load of rubbish? If I try abrading with 600 grit the top coat will just start to come off where the paint is not hard!

Can anyone shed some light into what I am doing wrong, apologies in advance for being clueless !
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[Grenage]

Some paints, especially the glossier kind can take a long time to fully cure; the thicker the paint, the longer it will take.

You're probably not doing anything wrong, other than not waiting long enough. I don't know if the Fortress trade paint is supposed to be thinned down; if so, you'll just need to wait a little longer still.