The first question is, "What caused the hole?". The second is, "Is it
If what made the hole is still present (eg rubbing against something)
and/or the hole is still growing (eg there is stress present that is
pulling the hole further open) - then those problems have to be dealt
with before the hole can be filled successfully.
Once those problems are removed, practically anything can be used to
fill the hole. There won't be any forces acting on the filler attempting
to reproduce the hole.
Personally, I tend to prefer to fix a small piece of the same material,
slightly larger than the hole,glued over the site - using adhesive
suitable for that material. Following the instructions that come with
the adhesive. If the material is suitable "Solvent Weld" works a treat
Thanks for the replies all - I've got suspicions that the crack
occurred roundabout the time that I had satellite fitted, it's not
growing and leaking a small amount of water. I've tried the bath
sealant idea above, just letting it dry before testing :)
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