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What is the difference in these products? I have been using IHG by hand on my black car, with good results, but still have some swirl marks. I'd heard somewhere that one of the other products (SMR or Perfect-it) was just a consumer version of IHG. Looking for feedback before I invest...

I have only waxed my black BMW twice, most recently about two weeks ago. I used Blitz wax the first time, then p21s this time (to avoid wax stains on black trim). Each time I've waxed I've also used 3M IHG first. My questions: I'm interested in waxing more often, but do I need to use a...