You need to try Bondo's non hardening Red Glazing Compound. It is far superiour to these other fillers. It is sandable,fine and not large grained. You can thin it by using liquid styren cemtent. It can be feathered out and holds onto plastic. And is cheaper and avaliable at most auto shops.
First, I’d like to thank Mike E for telling me about this stuff!!
I got the Blue Stuff molding sticks and they work as advertised!!
They are very forgiving and you can use them over and over again! I used it for a mold for some IJN Merchant ship cargo winches which are very small. They came out fantastic! I used Magic Sculpt to cast them and , voila! Nice little parts!! I will be trying to do a two part mold with the Blue Stuff next.
Bob Pink
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