This is a 1978 Evinrude 115HP outboard. I didn't notice any gasket sealer on either thermostat housing I took apart recently. I have a feeling that you don't need it unless it's just for holding it in place for assembly ease.<br /><br />Does the plate between the outer housing and the powerhead have two little bleed holes from the factory or is that an aftermarket plate? <br /><br />It seems to be made of some hardened plastic more than pot metal. (I learned the hard way as I had a seized screw and when I put torch to it I had a bit of a surprise when it flaked off.. Seems to not be too damaged but wasn't ready for what transpired.. Gasket should still have plenty of surface to seal on.. no warping that I could see..)<br /><br />Anyway... The 3/8" thick plate that the thermostats and valves sit in is where the bleed off holes I saw were on. I'm replacing the thermostats as one side of the motor is 107 degrees and not really warming up.<br /><br />One last thing... Is there any sources for the plate if I would need to replace it?<br /><br />That's it... Any comments will be appreciated.. Guvner..