What a bunch of BS over the fuel compatability of silocone. I have been in this hobby for 30 years and have allways used Silocone gasket materials. It doesent matter if it is clear, blue, black, or red. They are as fuel proof as you are going to get. Are fuel lines are silocone along with many very high end Super Charged and injected four stroke glow engines which are sealed with every thing from Silocone o-rings to silocone gaskets and are run on everything from 20% to 60% nitro.
Petrolium products are what break down silocone products, not methonal based model fuels.
Since permatex has come out with the Aluminum Color Silocone, I have switched to that, and that holds up 100% too.