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[Bob mode]Maybe "drying adjunct" is a more accurate term.[/Bob mode]
Another thought...
I don't think all spray waxes are designed as a 'drying aid' either. Mixing them with water can dilute their effectiveness I would imagine, and also the water would make it difficult to put a thin even layer of protection on if not designed to do so. Aren't they designated as spray-as-you-dry waxes and others are spray-after-you-dry waxes? Not saying you can't use any one in any way you want.
I don't use them as a 'drying aid' myself as they add more risk of marring from buffing it off and degrades your main/base LSP quicker than just blowing and blotting with a QD.
I use a lot of older drying towels that I would have replaced because they've largely lost their effectiveness in taking water off of the car while drying. They're still soft and don't mar the paint, but they do leave water streaks because less water is being retained in the fibers. But replacing them is not a necessity anymore as a result of these spray waxes. Because they allow my towels to really soak up a lot of water and fully retain it in the towel. If you wash a car that hasn't been waxed in a long time, the water will sheet flat across the panel and stick there for quite some time. So if I just barely mist these spray wax products across the panel, you can immediately see the break down of that flat water sheet. After spraying when I go over the car with my otherwise ineffective drying towel, I'm left with no streaking and I can use one towel to dry and wax the entire car without issue.
I primarily use TW's Wax & Dry as a drying aid, and then I go over the dried car with Meguiar's UQW for a final wipedown and that's my current 2-4 week interval wash and wax routine for my personal car. UQW should be more durable than TW's which is why I top it off, but TW's product smells great and is a really effective drying aid in my opinion. I can wash/dry/wax in total sun without pulling into the garage and pulling out the Porter Cable to go over the entire car with a wax or sealant once a month, wait for it to dry over, and then go over the whole car again to buff the product off of the paint...unless of course I have the itch to test a specific product out or wish to put a base layer durable sealant down once every 4-6 months.
So that's my experience with them. I continue to towel dry so I really enjoy using them. But for you, since you use a Master Blaster then you don't need one as a drying aid, but you can certainly use a spray wax as a maintenance wax or final wipedown after you're done with the metro.