I would like to know more about the Suncorite paint myself.
When I first got serious about accumulating Garands years ago, several local guys mentioned that the Britishicon Lend Lease rifles were quite often found with black paint. Oftentimes, the guys would remove both the paint on the metal and the red band on the front hand guard when the rifle came into their possession because they thought both were ugly and detracted from the firearm. I hadn't heard of Suncorite until fairly recently. The collectors around here just called it paint.
I have seen LL with paint and I have least one with remnants of it.