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RTV Mold Question

3 posts in this topic

BigR    0

Art Brush

In the RTV Crankbait Mold Tutorial you stated "Molds made with Moldmax 30 yield apprx. 150 lures before they expire."

Would the use of Bronze Powders help make the mold last longer or has anyone tried them yet?

"These powders, when mixed into molding material, provide an alternative to expensive metal casting. Known as cold-casting, the resulting part has the look, feel, and weight of bronze or brass, and can be polished with steel wool to a beautiful metallic luster. Add the bronze powder at a ratio of 2 to 1 by weight to the liquid components"



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Art Brush    0

Hey BigR,

No I've not tried adding anything to RTV silicone. It's not worth risking a mold not curing and wrecking a prototype or mastermold.

Coley's been using PMC 970 (urethane rubber) with a shore hardness of 90. It's less porous and stands up better to the resins.

Also compounds with a shore hardness 60+ don't really require seamline bb's as they are used to keep soft molds from distorting at the seam.

Post pics of your lures and molds buddy. We'd love to see'em.

Tight Lines,


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