Hi,I use some products in my job ,coating metals.Incalac must be sprayed in warm conditions or will go milky,Incalac in my experience is soft (good on brass that is only looked at not used , not  bells ,name plaques that will be handled. I have used POR which is very hard, it's a 2K for straight on metals but I found it very hard apply(spray).The best I found and is EZ to apply is just 2K clear,leave for 2 weeks before heavy handling (use).It comes out very clear on jobs,warm job in sun or lamps first and of course clean all polish /wax/grime off.
good luck,if you find some thing new let me know.
cheers bigdog