AkfixHT300 High Temp Silicone Gasket Maker (2x10.1 fl.oz.) - Red RTV Gasket Sealer, Flexible High Heat Silicone Sealant Up to 600F, Valve Cover Gasket Sealant for Automotive | 2 Pack

I love this stuff.... I use it on just about everything. It does exactly what they say it does and its cheap. Ive had problems with some of their competitors products in the past but never with this stuff..... the tubes also come with a reusable cap which is really nice..... the longest Ive kept a capped opened tube of this stuff laying around was about 6 months and it was still in the same usable condition as the day I opened it. I recommend some disposable gloves and some caution while using it though because that red wants to get on everything and it sticks good as long as the surface isnt wet

No leaks after used for a head gasket sealer on a flat head 6 cylinder engine.

Worked well.

This is good gasket maker!

Works great, but it's thinner than I thought and can be a bit messy if you're not careful.

It works and am content

Worked great for a valve cover gasket and no metal tubes breaking and getting silicon everywhere.

Used this on commercial smoker centrifugal upblast exhaust fan chimney and fire box chimney to seal the vent pipe. It adhered and cured very well, and quickly. It exhibits excellent adhesion, even after high temp exposure. I like the fact that it comes with a screw on cap to preserve unused RTV for later use. Smart! Excellent value.