I pulled mine out(not so easy), as it had a similar sounding split.
Epoxied it down the split, and set it up to cure in the correct shape.
Then on the back side of it(hidden side) I epoxied two long metal pieces(they come in radio kits, or central locking kits) about 150mm long, with their holed sections helping to get the epoxy to set across more surface area.
Worked a treat. Should have sanded and painted it first, but I wanted to be sure it didn't break on trying to re-install it first.
I didn't have any fibreglass to try that, and also I had lots of those metal pieces form the various rubbish I tend to hoard anyhow .. and metal is strong!
BUT! .. I wouldn't have thought that water gets into the cabin based only on that scuttle panel. It's not a water tight seal, and it should have vented section to allow air through to the ventilation anyhow!
So I reckon you probably have another issue allowing water in.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
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