cutting mdf inside?
I've used a router and table saw with shopvac attachments and neither worked perfectly. Some dust always escaped (sigh). By the way, the bonding agent used in MDF is bad for the lungs. Better to make cuts outside.
I doubt wetting the wood will do anything. This only wets the surface and the dust is from the wood being removed from the center. The only way this would work for be to spray it as you are cutting it and you don't want to do that.
and yea the MDF dust isn't really that good to ingest



.
