marc rosen wrote:
Hello Group,
I did a google search on this subject and most of the reasons were to
lock in the vapors. I want to use a very heavy (1&1/2 inch thich)
former computer lab desk for my router table. I have routed the cutout
for the insert but I'm reluctant to set the insert in without treating
the raw material. Do you think there is any chance the MDF could swell
when polyurethane is applied? (Also, if that were a problem, I suppose
I should avoid aqueous polyurethane.)
My insert fits very nicely right now (minimal tolernces) but I'm
concerned that it might become a problem if coated. Any comments?
Thanks in advance,

Marc


you're probably fine. even if the edge does swell a little from water
poly it'll stop as soon as it dries, and if the swelling is enough to
affect accuracy it will be easy to sand it back to size.