Hylowmar is that a brand name? Then what do you torque it to?
Hylowmar is a type of sealer.
We use it on A/C. It is great & fuel or oil does not really effect it.
I would use it on my 2 sroke engine when I was road racing. I used M.E.K to clean it off.
Silicone is affected by oil & water.
If you want a really good sealer try some CS3204 B 1/2
We use this constanly on A/C. There are other variations, plenty actually.
It is about $20 for a tube of it.
http://www.accrabond.com/images/CS%203204%20Class%20A%20%20B%20TDS.pdfAs far as torque to the valve cover? Cannot recall the spec but somewhere around 50 inch LBS not sure though, guys?
MBHD