1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 167Get this manual
Thoroughly clean and degrease the crankcase mating flange of the cylinder block with OMC Cleaning Solvent and let air dry
3638Apply OMC Locquic Primer to the mating flange of the
crankcase and let air dry
37139Apply Gel-Seal lito the cylinder block flangeThe application must cover the flange evenly and consistently without being excessiveThe application must not come within in (6,4 mm) of the labyrinth seals or bearings
Gel-Seal II has shelf life of at least one year when stored at room temperatureDiscard your Gel-Seal II if its age cannot be determinedUsing old Gel-Seal II could cause crankcase air leaks