Sealing Ultralight MDF Shop Jigs
Does anyone have any suggestions - especially on the "end grain" cuts. We currently do a three coat water base poly with sanding and that’s way too much work. It takes much longer than building the jig.
From the original questioner:
Shellac was my first thought, but the shellac sucks right in and takes more coats to seal than the water.
From contributor R:
Have you tried Glue size? Wood glue slightly thinned with water.
From contributor J:
One heavy coat of lacquer vinyl sealer will seal MDF.
From contributor G:
If it doesn't have to look pretty, one coat of heavy bodied primer, aggressively sanded back and one topcoat of whatever you like.
From contributor I:
If you can machine sand the end grain cuts to 400 grit or higher, they should seal much better for you.
From contributor C:
I have sealed a lot of MDF edges and tried everything. I sand with 100 grit then flood Bullseye dewaxed shellac on with a bit of lamb’s wool until it doesn’t want any more. For me sanding finer before doing this is a waste of sandpaper and time. Sand the result with 150 and you are ready for any primer or topcoat.
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