Sales guy: This new model features ceramic clear coat, offers better scratch resistance.
Customer #2: Oh okay....that's good stuff, I took ceramics class in high school.
Don't worry about it. It will work just fine. Nothing is going to fail cause you used a 5" BP on a Rupes 21. The 5" and 6" BP is almost identical in weight (+/- few grams).
Kevin Brown sells the Rupes 21 with either the 5" or 6" BP. Warranty intact I might add—so what's the out of balance...
Partial reviews are bad, but framed bias reviews from manufactures or their representatives are the worst! Ones with near perfect condition paint that is somehow painstakingly brought back to life with glowing review of the product.
I never cared for Hyper Polish spray. It created a pink mess and was not easier to use compared to a squeeze bottle. That combined with clogged triggers and I stopped using it.
I have used almost every waterless and rinseless product available in the U.S. You may have already deduced that Ultima as a waterless and ONR as a rinseless are arguably the best in category.
To answer your question—both types of products must have above average cleaning abilities, lubricity...
Love using SF4500, Reflect, Sonax PF, and Ultrafina to remove LSP, minor defects, and increase clarity all in one-step.
For me all the above products work better via rotary.