what i tend to find is tho when you come to take it off for say an underside resto you tend to find nothing but rusty steel that the underseal has been holding together!

i find the best combo is stonechip then basecoat and 2k laquer gives that concourse look too lol
failing that just sme waxoil as the fact it stays soft is what protects you from styonechips plus it actually converts mild rust back to a stable form of steel