So what's your favourite general-purpose silicone ?

[Beano]

I'm a bit confused about silicone...there are so many different types these days. Just to be safe, for the last umpteen years I have mostly used Permatex Ultra Blue, as it's very heat and oil resistant and sticks on surfaces quite tenaciously..

The other thing I like about it is that it lasts a long time in the tube. I got one if their other colours and it went oddly hard and brittle in the tube. I seem to recall it was the grey.

I know there are some you shouldn't use 'upstream' from an oxygen sensor, but which are okay ? And which is your favourite, overall ?

 

[PeterT]

ThreeBond 1211 almost everywhere and Loctite Copper Maxx instead of exhaust gaskets. Add Loctite 569 thread sealant and 243 for thread locking, and that’s about my whole toolkit.

 

[DoubleChevron]

you use the coppermax instead of gaskets? Even manifold and flange gaskets (I've covered the gasket in coppermax, but never left the gasket out)

 

[PeterT]

you use the coppermax instead of gaskets?

Yes, I bolt exhaust flanges such as Mi16 and GTi6 direct to the head. I think it can cope with up to 6mm of gap.

 

[flock]

I'm a convert to 1211 now after my rebuild. I still use anaerobic flange sealant gel on things like water pumps and thermostat housings where they have tiny mating surfaces because its a bit nicer to work with and I've never had a leak.