LIST,
When filling holes that will be subjected to moisture from the back
side I
have used JB Weld and similiar products to fill first then applied the
bondo. Once I filled an antenna hole using epoxy weld and fibreglass mat.
I recessed the hole with a ballpeen hammer then backed up the opening with
masking tape and applied the mix. Finished up the entire job as normal and
its still holding 18 years later. If you have an area that you can't get to
the back of, just put a lot of hardener in your mix and slap it in. Let it
set up and make another batch and keep filling this way until complete. Use
80 grit sandpaper to smooth off the blobs and shape up the area and then
finish up with your bondo.
BOB
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