Is it possible to infuse over car body filler

I have made a mold I used alloy as the plug and the gel coat has come away from the alloy

Its to big to put gelcoat in so im thinking filler

The part wont be seen as most of it is under the car

Obviously don't want to make the mold again

So is this possible ?????

As above Epoxy and Poly for that matter will stick to the filler like pooo to a blanket. If the surface finish isn't that important then you can cover the face of the mould with bagging film using spray adhesive. ( after filling with bog) This will give you a surface that will release but the surface finish of the part won't be pretty. Brown packing tape and cling film also work but again the surface finish of the part will suffer.

Carbon Copies Ltd

I may try filling with bog then some more gel coat,

If you just apply gelcoat it won't cure.

Carbon Copies Ltd