Help with molding heads!

[6pointer]

I usually keep the original skull and bill but just read the casting thread in the tutorials using silicone and bondo. The molding sounds fairly simple to me but my question is do any of you mold each and every head to ensure a exact fit or do you mold multiple one at a time and just use them? What if one mallar drakes head differs from the next? I'm new to this as I've always clean my heads out and painted the bill. Thanks!

[DWC Taxidermy]

I do mold each and every head because all ducks are different and so are their head sizes.   Maybe over kill on my part but my customers like the idea. 

[delta hunter]

If the mold is good, I make several heads. Then I compare the size when I skin the next one. Most of the time I can use it on the same species.

[6pointer]

Ok thanks. I figured that one mold would fit most BUT it's not a perfect fit so that's why I asked to see what other people do. I don't mind keeping the head but I feel like It would be less time consuming not having to clean the head out.

[drakeman]

You can use the same mold for multiple heads.   Not any different from buying the commercial heads.