I have never used any QD in applying ultimate wax. I have never had any streaking issues with the liquid version either. In regards to your question about UW vs M21. They are both great sealants. It`s not whether one is better than the other. UW will last longer than M21. There is no professional equivalent to UW. M21 and NXT are closely related. M21 gives a little more candy coated look where as UW will tend to darken paint more. M26 is a carnauba wax.
I would not either. It works fine as a stand alone QD after one`s LSP has properly cured as I have used it with UW, M21 and M26 with no issues after they have all cured. But I do prefer M135 and D156 with either LSP.
Competition Ready Team 1929 Bentley
1999 Silvermist Metallic Pontiac Grand Prix GT
2002 Arctic White Chevy Camaro SS
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