Jump to content

- - - - -

RTV Mold Question

  • Please log in to reply
2 replies to this topic

#1 BigR


    New Member

  • TU Member
  • Pip
  • 6 posts

Posted 24 June 2005 - 06:20 PM

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"


#2 Art Brush

Art Brush

    Advanced Member

  • TU Member
  • PipPipPip
  • 505 posts

Posted 25 June 2005 - 06:19 AM

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,


#3 Coley


    Advanced Member

  • TU Member
  • PipPipPip
  • 1,061 posts
  • Location:

Posted 26 June 2005 - 06:49 AM

Coley is using PMC 790, little mistype there Art.