You can use VHT or about any clear coat.....Then after installation, I went back over(touch up) with clear Testors modelers clear with a modelers brush. My brackets, bolts,etc, have been done over 10 years now with no problems.
1969 Mach 1, MCA Conservator #105
MCA Concours Gold Card '69-'70.
MCA Certified Judge 64.5-66 & 67-68.
MCA Certified Judge OD/DD.