I have 4-1 mixed 3oz to 24oz of water been sitting since last Oct. 8 months it has not separated.
After reading what Mr Clean thinks is a Strong mixture I know why mine leaves the surface so slick.
I use 3 ounces of 4-1 in a 32oz bottle but only add 24 oz of water that way I have room left in the bottle to shake it good.
Even at this mixture it is far cheaper than any QD
I take a bottle to the show and keep at least one or more sitting around at home with the 4-1 mix
This year on my show car I'm going to use NXT 2.0 and UQD I like this combo on my Black car
The DG 105 has slightly more gloss and more durability but to me the NXT has a nice gloss with a little more depth than the 105.