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MarkMK - 10/24/2019 9:22:35 AM

If you're happy with the basic shape, in that it doesn't pose the risk of a mechanical lock, after sanding back the filler/bondo it would probably be best lay a couple of light fibreglass layers over the pattern

Even if well coated with a suitable paint system, filler/bondo is likely to pull away when it comes to creating an initial mould so the fibreglass skin will add some strength. Once the fibreglass has been roughly sanded, a thin skim of filler can then be used to create a surface smooth enough to apply a top coat. 

The pattern coat primer and hi-coat gloss system that EC sells would be ideal, but some other kind of coating that can bond well to the bare pattern and provide a reliable release surface, after flatting and polishing, depending upon what's available where you are will also work

This will give you a female mould from which you can then create your final male mould using a tooling gel coat and fibreglass reinforcement