Not gonna argue that the gaskets alone won"t seal and work fine, but I was an ASE certified mechanic for a GM dealership for many years and I always put a thin film of silicone(put dab on finger and smear it on real thin) on all waterpump, thermostat housing, etc. gaskets and I"ve never had a problem with any of them leaking. The thin film of silicone acts more as a "glue" to hold the gasket in place during assembly than as an actual sealer, although it does make up for any slight surface irregularaties in the parts being assembled.
The one place where I WON"T use silicone is on a cork gasket on an automatic transmission oil pan or engine oil pan. On these thin stamped steel parts the silicone is just too slippery and will let the cork gasket slide out when it"s tightened down and the pan warps slightly(in a service shop setting ya don"t have time to let the silicone set and "cure" for several hours).
That being said, both with or without silicone will work fine in a waterpump application, whichever way the installer is more comfortable with. Just don"t overdo the silicone.
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