I’m putting it in the XJS list because it’s been discussed here in the past (as well as the V12 list) and it has to go somewhere.
GM 1050026 has been suggested for years by various folks on the list such as Chad Bolles for lots of sealing jobs like the cam-covers or even water hose connections. It is, as far as I can tell, pretty much NLA.
The original MSDS on 10-2018 tells us it was made by Perfect Seal Inc in Canada as Perfect Seal #4.
Chemical Name, CAS Number Prefix Value
ISOPROPYL ALCOHOL 67-63-0 = 24.1 %Wt
2-PROPANOL, 1-METHOXY- 107-98-2 = 4.8 %Wt
Silica 7631-86-9 < 71.1 %Wt
CASTOR OIL 8001-79-4 < 71.1 %Wt
Soybean oil, polymd., oxidized 68152-81-8 < 71.1 %Wt
As it turns out at least two other companies who’s products are still available used Perfect Seal #4 under their brand name: - and or have CAS # percentages in generally the same balance.
Evanrude Johnson # 0508235
And also Mercruiser/Mercury Marine 92-34227Q02
The New PN for 92-34227Q02 is 92-8M0170149 and is a Permatex product:
(AVIATION FORM-A-GASKET #3 SEALANT)
It’s CAS formulation and balance is NOT identical but has some similarities.
And then there may be Permatex aviation Form-A-Gasket PNs that confusingly are different.
E.g. (3H AVIATION FORM-A-GASKET #3 SEALANT) seems more similar to GM’s formula than the updated Mercury Marine Aviation Gasket Sealer:
Supposed additional cross references
MERCURY MARINE * 92-34227Q02
LOCTITE * 1525607 (Very Similar)
PERMATEX * 80017 (Not as similar)
Hope you enjoyed this little rabbit hole.