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Tip O' The Day


Tip O' The Day

RTV molds    


[Science!]

Category:

   Molds and Casting

Submitted By:

   Chacal

Tip:

   If tou have to make a mold for a large part using RTV rubber (or silicone) you will need a great deal of it, and it is not cheap! When I need to save a little, I make my molds in layers: First a harder layer (add more catalyst and wait a little before pouring the mixture over the part -- so that the part is covered with a somewhat uniform layer all over; then add more RTV mixed with filler -- old RTV molds, chopped up in little cubes. RTV bonds to RTV, and the old molds have the same flexibility as the "fresh" RTV, so the molds are as flexible as if they were 100% new RTV, but using about 40% less of it.


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Tips database last updated 21 July 2014



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DISCLAIMER: These procedures and practices represent the recommendations of the members of the Starship Modeler readership. These ideas are not necesscessarily endorsed for their saftey or results by the staff of Starship Modeler. The reader assumes full responsibility for any and all results stemming from the application of the procedures and practices listed here.








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Previously updated on 9 May 2007 and 26 August 2014. Source last updated on 11 September 2022.

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This page copyright ©1999-2022 . Previously updated on 9 May 2007 and 26 August 2014. Source last updated on 11 September 2022.