RTV molds |
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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