Sealing the rough edge of MDF
Discussion
Well PVA isn't a very good suggestion because it never sets hard enough to sand without tearing.
Filler, especially 2 part filler will be far too hard and likely cause high spots with the softer MDF. It is also hard to sand.
The best way is to sand the edge down then paint with sanding sealer or primer. Allow to dry then sand flat. If necessary repeat. The sanding sealer in particular penetrates into the MDF hardening it and stopping the fluffy edge when sanded back.
Filler doesn't penetrate the MDF so once sanded through you still have a problem.
As has been said already with a bit of thought and being prepared to wait for coats to dry you can achieve an excellent edge on MDF.
Henry
Filler, especially 2 part filler will be far too hard and likely cause high spots with the softer MDF. It is also hard to sand.
The best way is to sand the edge down then paint with sanding sealer or primer. Allow to dry then sand flat. If necessary repeat. The sanding sealer in particular penetrates into the MDF hardening it and stopping the fluffy edge when sanded back.
Filler doesn't penetrate the MDF so once sanded through you still have a problem.
As has been said already with a bit of thought and being prepared to wait for coats to dry you can achieve an excellent edge on MDF.
Henry
Manks said:
I should add that the rough edges will sometimes fall in difficult to sandpaper places. There is a risk of roughing up other surfaces in the process.
Then use a Stanley knife blade held verticallyish to the surface and scrape it instead. With a bit of care you should be able to smooth the required surface without affecting other areas or cutting yourself (that won't matter so much if you are using red paint).If you can't get to the edges in question at all, then you will need to redesign the product until the edges aren't visible.
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