Hey guys, I know this has been posted several times but I just cant find the answer I am looking for.

What are you using to seal the cap and the lines on the lid. IE: I have a juice tank that I drilled two holes through the cap, installed a nut on each side for the fuel and vent. Can I just use like a rtv silicone type of sealer? What is preffered and what are you guys using?

Thanks in advance,
Larry