JWBH wrote:
Have a piece of oak veneered mdf that i wish to use to make a shelf
along
side the bath.
snip

Don't want to burst your bubble, but you can't get there from here.

Doesn't make any difference how you try to seal the MDF, my guess is
that it will take about 6 months before the MDF starts swelling from
water splash and high humidity in the bath room.

If you want an oak shelf, try oak veneer over a plywood core.


Lew