well here it is results time.
Did some panels with Blitz some with P21s
What i noticed, Shine and depth much the shame, possibly as they were applied over about 4 or 5 coats of P21s. Didnt want to strip it off and start a fresh. Blitz maybe looked a little deeeper in colour but didnt have the same wet look as the P21s. The blitz went on and came of easily. I found that if the paint hasnt been polished before waxing, ( i this case i did some test panels with Megs Hand polish) Blitz goes on easier than P21s. Apperance wish after a quick detail all panels looked almost the same, all though P21s ones felt slicker. I have done half of the bonnet (hood) with one and half with the other, and the same on the Roof ( half p21s and half blitz to test durabilty) on the sides some panels are also done with Blitz topped with P21s which look amazing, if it hadnt not got dark i would have done some panels with two caots of P21s and two coats of Blitz to see if it was that two coats made it look better not, just the fact products were mixed.
I reckon from now on as I can buy blitz over here, i will save the amount of P21s im using i will be using a blitz base topped with P21s.