I just picked up a tube of the ultra gray permatex, specifically for thermostat gaskets and the
directions say to wait 24 hours before filling with fluids. In fact, every Permatex tube on the
rack at the parts store, no matter the application, says to wait 24 hours before filling with fluids. WHAT? Looking at my old tubes, they have no mention of a waiting period, other than a bit before tightening.
Is this a super conservative move on Permatex's part to stave off complaints about leaks, or
has their formula changed?
Anyone use this new stuff and 'fill with fluids' right after assembly?
gjz30075 wrote:
Is this a super conservative move on Permatex's part to stave off complaints about leaks, or
has their formula changed?
this would be my guess. yea maybe you could apply it then slap everything together and it doesnt leak a drop, but if it does Permatex can come back and say "we told you...". I usually just stick with a couple of hours for dry time to be safe.
Its there cover your ass policy. I think they changed the chemical compisition a bit because the ultra black and grey ive used recently took an hour to tack up decently enough to feel comfortable bolting it together.
Previously with ultra black i waited about ten minutes.
I can almost assure you they took the good stuff out and its probably not worth crap anymore.
Right Stuff still says "can put immediately into service".
spitfirebill wrote:
I can almost assure you they took the good stuff out and its probably not worth crap anymore.
Ehh, two weeks ago I just did a thermostat with a brand new tube of Ultra Black, both sides of the gasket. I waited 10 minutes to torque, an hour to fill, and another hour to crank and drive it for a full warm-up cycle. Same process I have used with the stuff for 30 years. It's holding just fine. I'm agreeing with the CYA theory.
Prematex customer service is pretty good. Ask them.
Easy way to find out, get the MSDS for the old and the new tubes.
I had an issue on my MX-3 with the F2T Swapped in it. It was leaking on both sides of the Tstat housing to head , and the rear timing cover to head. I put it together with the grey Permatex, filled with fluids leaked profusely. Redid same job, and waited per directions, no issues at all.
I exclusively use Toyota FIPG sealant. Stuff is awesome.
Assemble within 15 minutes and "engine may be started in 1 to 2 hours"
