[NostalgiaRadioTime]

Never had a problem with seepage in spraying the 3M on any of the probably 100 wood cabinet radios I've used it on over the years. But as with anything, other results may vary. Just a LIGHT coat on both surfaces...that is if you're attaching it to a backing board. When I've removed old grille cloth this seems to be the standard of how MOST (that I've encountered anyhow) were attached from the factory...the adhesive they used was over the entire backing board, not just around the edges. I agree, NEVER spray directly into an empty cabinet or you'll have a sticky mess on the grill work. For radios where the cloth is glued directly into the cabinet I've always used a small dollop of RTV (or as my Dad calls it "snot") on my finger and carefully smear it on the inside of the cabinet around the perimeter of the grille opening so that it's very thin, making sure to stay far enough away from the opening so it doesn't seep out when you press the fabric in place. It holds well...never had a grille cloth sag or let loose years later, and it dries clear. But it's great to hear what others do and to have options. Take your time and do whatever works best for you.