CJ – I’d also suggest following
Molleur’s advice about building up the thickness with fibreglass matting.
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Given how rough my car is in places, feel free to ignore what I did when building my scuttle.
As I made some ‘Home Brew’ filler, that started with some scraps of fibreglass matting.
Then resin and catalyst are added as normal.
This created a rough sea of fibreglass.
Before an angle grinder removed the peaks and left a series of voids.
Which acted as a good key for the ‘normal’ fibreglass filler.
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Good luck, Paul.