1) use Nomex thread to secure the patch to the outer most layer of the suit
2) use Nomex thread AND Nomex cloth, to back the patch (to prevent hot spotting if it catches on fire), then sew the patch on
3) use unwaxed, cotton cloth that will burn away so the patch falls off
4) use fabric glue to attach the patch
Then I've also read stories like this:
A few years back, I saw a person get serious 2nd almost 3rd degree burns from a flash fire of racing gas(brake lights sparked the fumes in the car). There was nothing wrong with the suit after the fire, all of his burns came from the heat transfer thru the suit and the little pin holes around the required SCCA patch!
Rich
I'm curious what you all think?