1970 "DUPED" Dart Swinger

That's a lot of sealer. For my own info, is it necessary? I smeared a little around the coolant holes and that was it. Hoping it will suffice??
All I did was put a small bead on the gasket then smoothed it all over the gasket with my finger front and back. When I torqued it down I just ran a towel around the edge so it smeared on the block a little. There is actually hardly any sealant on the gaskets. Just enough to make it stick. I think the blue makes it stand out a lot. Plus the gasket is blue.