[corndog71]

So I'm almost finished with my subwoofer cabinet and some friends of mine thought it looked cool in it's raw mdf form.  Is it possible to just slap a few coats of polyurethane onto raw mdf?

[fcraven]

Yep, you sure can, or if you want to get fancy you can apply some wax to it.and leave it...
not going to be that durable... but hey it works.

I apply some wax to my Festool work table (which is MDF) so that "stuff" doesn't stick to it.

[Christof]

Yes, but seal it well and stay away from water-borne finishes unless you know what you are doing.

Check these raw mdf panels out.....bet the price is through the roof but they would make a nice cabinet