My DE sits just below 60psi (about 50) at 60mph in 6th gear and has done for all the 4 plus years I've owned it without a single problem. Not sure if it's the same on a HR?
I'm on the caddy2k oc for my van and a few people on there have said the plasti dip has stained their paint work after being on for a while and then removed. I wouldn't risk it on the whole car myself.
Oh and it looks crap anyway!