VHT VHT (SP736-6 PK Gold High Temperature Brake Caliper Paint - 11 oz. Aerosol, (Case of 6)

How many cans did it take to do all 4 calipers? Or is one can good enough?

can i use this product to heat-proof an art project trivet made of ceramic tile with decorative paper on it?

Can I use this to paint a cooktop? I'm having a hard time finding high heat paint that comes in a gloss and not flat finish.

Can I just paint over existing caliper paint? I have red that’s chipping, can I just paint it black over it?