Filling & Painting MDF

[Peterade]

I have some MDF cupboards & under the stair cupboard panels which are raw.

I understand from this great forum that I should seal with Rustins MDF sealer but do I fill screw holes first or seal first?

I want to finish with Dulux Satinwood.

Grateful for any tips.

Peter

 

[foxhole]

Fill first.

 

[Peterade]

So I fill first then seal & paint.

Thanks