I dont know about mowers but most head gaskets dont need any sealer. Infact they tell you not to use one. Sealers dont compress well, and you really need a tight uniform seal around the combustion chamber. One thing/trick I did read was that some engine builders spraya light coat of aluminum paint on the surfaces for adhesion. I guess it is thin enough not to interfere with the seal.
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1970 Stang Conv:
en:Boss351 (balanced/blueprinted)
mech cam(240*@.050/.540 lift)
Scrw in studs/comp cams rllr rkr
Mldn valves 2.19in 1.71ex
ported polished cc'd hrdnd ex
Keith Black FT pistons(10.25/1)
Weiand Excellorator manifold
Holley700 DP mech 2nds
MSD 6 box and Dis
Headers/2 1/2 inch duels
tr: modified FMX
re:9-inch/3.89 limited slip
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