Sealant for pipe

When I acquired my bike some years ago the guy before me had some sort of red sealant around where the pipe goes into the head. Was wondering what it is and if it's a good idea to do it again? Worried about water and what not finding its way in and would like to keep exhaust and oil from coming out of the area.

Guess I should specify....1999 kx 250. Had red sealant in the pipe springs and around where it meets the exhaust part of the head.

make sure you have newer O rings installed there and then use the red RTV gasket maker sealant to seal it even better. 


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