Gillespie 383 tough enough for under chassis?

[KAILUAZ]

I'm to the point on my project to start prepping the under chassis for paint. Is the Gillespie tough enough to use on the under carriage or should I go for something like POR-15 or Eastwood's chassis black?
Thoughts?

 

[319]

Paint would be okay if it's going to sit in a museum but if you're going to drive it you need something tougher. I've never used the POR-15 but from what i've read on this site it's what you want.

 

[KAILUAZ]

I'm going to end up using Rustoleum BBQ Black after some asking around. Tough enough and cheap.