I've made up a mounting bar to fit driving lights to my Sporty which will bolt up to the top, front engine mount bolts on the downtubes.

After I remove them to fit the bar what breed of Loctite (if any) should I use when I refit the bolts?

Thanks in advance!

Blue would be fine for your application  not sure what virtual t is on about but the factory use red and 

Thanks for the advice gents, will grab some.

I have to buy a workshop manual too, preferred manual (aftermarket?)

Bike is a 2016 1200 Custom.

For my bikes, if it comes off it goes back on with Loctite. Its that simple.