For filling holes try thin CA and baking soda. Back the hole with a piece of masking tape, fill hole level with the baking soda.....1 or 2 drops of thin CA and it sets instantly. I have used these materials in many many automotive replica builds.
I used thick CA to mold in panels when relocating fenderwells. Make clean careful cuts.....bond with the thick CA and use a kicker.
When it comes times to file and sand, you'll end up using no "putty" at all on your seams and holes.
Sink marks and shallow dips still need to be puttied, but overly deep ejection pin marks can be filled successfuly with the CA/Baking soda trick.
And a bonus....the CA/baking soda mixture never shrinks.
Sid
I used thick CA to mold in panels when relocating fenderwells. Make clean careful cuts.....bond with the thick CA and use a kicker.
When it comes times to file and sand, you'll end up using no "putty" at all on your seams and holes.
Sink marks and shallow dips still need to be puttied, but overly deep ejection pin marks can be filled successfuly with the CA/Baking soda trick.
And a bonus....the CA/baking soda mixture never shrinks.
Sid