Silicone 'instant gasket' sealant & Nitro fuel

[PhilPat]

Hi guys,

Am wanting to use an instant gasket type product to seal the backplate on an old OS21 RF-B (& maybe the carb body to crankcase joint too).

The product i've bought states it's a silicone sealant but not suitable for fuel systems. I know that silicone is degraded by petrol but wondered if the methanol/nitro fuels we use also attack silicone? Does anyone have any recommendations of a suitable sealant - I do have some blue hylomar, would this work?

Many thanks in advance