Just curious do you guys use any sort of gasket sealer on the thermostat housing gasket? I have one leaking.

I do thin amount black permatex 82180

I had a thermostat housing leaking (goza), it ended up being the 4 bolts loose that held the body to the base.

I don't use a gasket, only sealer. I did however machine my own thermostat housing that has a -12AN male on it.

If it’s an aftermarket one try taking a flat file to the surface have found so many warped or deformed and yes still use thin coating of sealer

I use this reusable gasket.
https://www.summitracing.com/p...5-ctbB8aAhm-EALw_wcB

Yes. I recently installed one with blue Fel Pro and it leaked. Installed another with blue FP and coated gasket with thin layer of Ultra Black - no leaks.

I rther not use sealer if cna avoid,but when its leaking. I would use the black or gray and calling done.