80scoinops
Well-known member
Need to fill a 3x4" gouge about half the depth of the particle board in the side of a cabinet up near the top. Is it okay to fill with patching compound (fiberglass bondo, wood patch, spackle, etc.) without treating the MDF surface first? Is the moisture in the patch enough to make the remaining MDF swell (and possibly break on the other side)? Or am I overthinking and bondo/sanding/painting will be fine?