Filling screw holes in MDF

[ClockPie]

Hi

I'm making some permanent units out of 25mm MDF from a supplier who primes/undercoats from the factory. Of course, I'll be making cuts etc so have some primer and undercoat, and will gloss over

I may spend time dowling most the joins but I'll be stuck with the odd screw I need to put in, and may need to pocket-hole a few too. As its all going to be painted I'm not going to stress if I can't figure a way of hidden fixings.

But I've never filled wood or MDF (!) - never needed too - normally engineer a way around it.

Any recommendation for a filler for covering screws and pocket-holes? Would rather a recommendation than a random purchase. Assume fill/sand/then re-prime/undercoat/gloss with fine sanding between.

Not sure on difference between 1 or 2 part? And want something that can be sanded nicely and not set like granite

Thanks

 

[stevie888]

Ronseal 2 pack is great stuff to use because it sets very quickly and sands beautifully. White or natural clour avaialble.

Don't overdo the hardener though else "very" becomes "too"

 

[ClockPie]

Ronseal 2 pack is great stuff to use because it sets very quickly and sands beautifully. White or natural clour avaialble.

Don't overdo the hardener though else "very" becomes "too"

Spec looks good and viable. Thanks
Doesn't mention MDF - any reason why it would not work?

 

[slawit]

No

Spec looks good and viable. Thanks
Doesn't mention MDF - any reason why it would not work?

No, this will be fine, couple of things I would add though. Mask up around the hole before you start to fill, then remove the tape before it hardens this will limit the amount of sanding you need to do. Make sure you push it in really well, I tend to push it into the hole then dig it back out I do this a couple of times to ensure it coats the entire hole without any air gaps, then leave it around 5mm proud of the surface. Most important don’t sand it immediately, it will only take around 10-15 minutes to harden but leave it overnight before sanding, if you sand it flat as soon as it’s hard it will sink below the surface by next morning. One last thing, sand it using a machine or a cork block, not just by hand.

 

[foxhole]

Two part wood or car filler , both sand to match mdf smooth surface .