Believe it or not, I still have some Meg's Engine Kote. When that goes, I'll try Sonus Motor Kote, or I'm supposing, the clear Trim-A-Shield product for a semi-permanent gloss. I've tried Mop & Glow floor shine although I find the above automotive formulated products to look better. I assume this could be to lack of cleaners and more acrylic. :nixweiss. The M&G is going to vary in look from wheel well to wheel. Interestingly, I found it to look outstanding on the rear wheel wells of my dad's C4 'vette.
I've tried the tire foams, both DM and the PDMS tire dressing, the gels, etc. and they all do not seem to last very long when exposed to anything more than a few puddles. The heavy silicone dressings attrack every dust particle that come in contact with the wells too.

I use to order cases of canned stuff because if I wanted pristine wells, I had to apply it often. I bet you could imagine what the street in front of my house must've looked like due to using that stuff all the time
When I first learned about Meg's Engine Kote I thought it would be ideal for my wheels since I understood it to be a better lasting dressing with a nice gloss. I tried it and granted, it's not as user friendly as AA, MSLT, etc but it lasts a bit longer and dust collection is greatly reduced. I find if I attempt to spray it on, globs may dry that didn't roll and smooth out in time. I fixed thus problem by applying it directly to a long handled sponge. For optimum looks, I let one coat dry completelt and apply a second. Don't let this stuff get on your paint. I did the same thing with the floor shine and I'm picturing Motor Kote to work the same way. Unfortunately though, gallon sizes of this type of product are not available.

This makes me miss EK.
I'll look into the CD-2 and will eventually, probably try the clear Trim-A-Shield. It will be a mini project in it of itself but hopefully the reward will be great durablity and easy clean up during washes.
Sean, in your particular case involving volume of clients, it sounds to me you should stick with what you're doing or buy the other kind of dressings I mentioned by the gallon or the case.