Can it be done?

Or must it be sealed first? Sealing presumably is done with some pva/
water mixture?

Cheers for any advice.

Jon

Jon Parker wrote:
Can it be done?

Or must it be sealed first? Sealing presumably is done with some pva/
water mixture?

Cheers for any advice.

Jon

Can be done. You will need to rub down and use many coats on the edges
though.

Which then seals it ;-)

On 30 Sep, 14:28, Jon Parker wrote:
Can it be done?

Yes. I do this regularly for workshop jigs, to avoid them swelling
from damp.

Two primers work for MDF: either dedicated MDF primer or shellac. If
you use anything water based instead, including PVA, you get swelling
of the fibres. This makes the edges swell, or raises odd fibres on the
surface. Shellac is cheap, quick and works well.

Edges take three coats before you even notice it's there.

"Jon Parker" wrote in message
...
Can it be done?

Or must it be sealed first? Sealing presumably is done with some pva/
water mixture?

Cheers for any advice.

Jon

Yuk!
Varnish on PVA!
General principle: *always match like with like*.

Varnish is an excellent sealer (PVA is just cheap) - but use the 'diamond
hard' (or indeed shellac itself or similar hard resin) or it will always be
tacky. Incidentally, even chipboard polishes up nice and varnishes
effectively if you have the patience to sand it carefully down through the
grades.

S