Like the original molded lines these will dry and shrink with age if used with Alcohol based fuels. The best way to minimize potential leaking wtih these and OEM lines is to use a product available at most hardware stores in a yellow tube called Seal All. See picture below :
Our goal is the manufacture of top quality reproduction gaskets and stickers to make your saw look and run as it should.
Brian Genrich
Store Owner
I started out working on my own saws, and found that after years of helping others, I had the essential tools to bring replacement gaskets and stickers to market at a reasonable price to help others interested in the hobby.