Painting mdf

RobTi · 19 May 2020 at 14:56

Hi I have an old subwoofer that was stored in the loft and got slight rain damage over the years, so have stripped it down and planning on painting it, so sanded and at 5he points of water damage it can be picked out easily like fibre, was hoping a spray with building up primer would do the trick, or what is suggested to seal it and get a base coat ?
Thanks

Puzzled · 19 May 2020 at 15:00

MDF goes horrible when wet but you can buy MDF sealer to try and prevent the same happening again.

RobTi · 19 May 2020 at 15:04

Puzzled said:
MDF goes horrible when wet but you can buy MDF sealer to try and prevent the same happening again.

Thanks off for a look

Pho · 19 May 2020 at 15:12

Not an expert but could you not use a wood filler to fill the wood you've taken out? Build the filler slightly proud of the rest of the wood then sand it back down to create a smooth surface to paint on.

BusError · 19 May 2020 at 18:28

Nah just paint it first with a thicker solution of Pva let it sink do a couple good coats, then sand it down and paint on..

Edit: autocorrect!

Mr.Pink · 19 May 2020 at 20:37

Made an MDF cupboard last year, and had great results with a few coats ofthis and a roller.
Fine sanding between coats
https://www.screwfix.com/p/zinsser-...FwIHXhjGHqQNVr6ndhBoCLDEQAvD_BwE&gclsrc=aw.ds

PardonTheWait · 20 May 2020 at 00:50

If the MDF’s been wet you probably won’t rescue it easily if at all. You could just get rid of all the furry bits and build it up with filler but it won’t be great.

You could build a new box for it? You’ve got the old one to copy from.