I've achieved a minor improvement in looks by spit-shining Souveran over Collinite, but *generally* speaking IME Collinite:
a) has a look that you either like or don't, and if the latter you oughta just use something else.. and, more importantly
b) Collinite seems especially sensitive to prep; I thought it was muting the flake on the GMC but after repolishing with a different finishing polish the flake was nice and impressive with 476S.
Somehow I don't see NXT improving the look of Collinite, even if it *does* bond OK.
No idea if it *will* bond, but note that Meguiar's LSPs can be used over their Pure Polishes, which can cause bonding issues with some LSPs that are sensitive in that regard.