Is sealant really necessary on a thermostat gasket?

Going to replace the thermostat on a 3.9L (318 clone) Dakota and had to remove the A/C compressor to get at it. The thermostat gasket is one pretty thick piece of paper and it seems it would be more than adequate to fill any voids (large or small) in the intake manifold or thermostat housing itself. Will it work out just fine without gooping it all up with additional sealant? Thank you.