Maybe real fine stainless or iron filings. Drop into worm as you pour. Add
both weight and flash.
Bill

"RichZ" wrote in message
...
Salmo wrote:
Can you add something to it, before heating it up,
to make it heavier?

Salt.

Unfortunately, keeping the salt suspended in the molten plastic is
difficult. It will try to sink in the pot and in the lure before it cures.
Same goes for glass beads and sand.

RichZ©
www.richz.com/fishing