-
I’ve just finished some MDF shelves that I wanted the edge facing out to look as smooth as possible and used wood filler. I watered it down slightly and applied a really thin layer with a putty knife, let it dry and then sanded back before applying primer and paint. I was happy with the finish
-
The professional answer that you don't want to hear is sanding with a rotary (not random orbital sander) through grits 80 to at least 400 in four stages (i.e. 80, 150, 250, 400).
Then you have a surface very similar to the face of the board.
In fairness you can use thicker primers, filler etc if you have time and not the equipment to sand it effectively. If you are going in that direction I would use an MDF primer like Johnstones one which has a lot of solids in it and then fill with something like Toupret Wood Filler. It's not the best way time wise but you can get there with patience.
You are reading a single comment by @rhowe and its replies.
Click here to read the full conversation.
TTM
Airhead
@rhowe
Had a cupboard built from MDF. The carpenter left a few edges like this. I guess they need sanding back a little before painting, or do I use edging tape?
1 Attachment