81158-12PK Black Silicone Adhesive Sealant, 3 oz. Tube (Pack of 12)

Very solid drying silicone for most auto jobs.Works great on the china rails on Ford and Chevy small and big blocks.I have used it on oil pans and valve cover gaskets and have never had a issue. I buy it buy the case because the parts stores are much to high, I keep it in the house so it will last much longer due to temp being controlled.

I use it mainly to weather proof electronic devices on electric bikes I'm building (ebikessf.com), especially to seal around electric cables where they come out of enclosures. This stuff is very sticky - bonds to almost any surface, flexible - doesn't easily crack, doesn't conduct electricity - I use it on circuit boards. However it is toxic, use it in well ventilated areas, wearing respirator is a good idea, definitely wear cloves, this stuff gets under the skin and is really hard to wash off.

this has may usese seals great and handy tube size

Black rtv is just a good all around silicone.I have been using black for years with good results where oil or water is involved.Ultra black and ultra gray are better for high pressure and red and copper are best for high heat. This is the same rtv that comes in some fel-pro gasket sets, just in a very small tube.

If you want a gasket or something like to seal than this is what you should use. If you do it right itll never leak

He comprado este producto por mucho tiempo y este paquete he abierto tres tubos y estan duros adentro que no puedo utilizar el silicon, aun me quedan mas por abrir pero los usamos segun sea necesario y mi temor es que hayan mas con este problema que no sirven.

looks good

Don’t buy. Product going bad. Getting old.