I would pick up duetto between two since they have almost same ability but duetto is more user-friendly and shaper on the corner.
if having another one ,it must be 21 with no doubt. The best combo is 21 and duetto or 75e( if you already have pc or GG6, I will skip 75e to save money)
I used both menzerna sf4500 and rupes ultra fine on each panel using duetto 12e.
on rupes side , three or four passes ,it turns clear, plus the smell is good.
on sf4500 side, six passes still hazed.
normally, how many passes to break down sf4500 using DA?
after reading every replies ,seems like stalling issue caused by bad technique but The guy in the video is chemical guys detailer,Isn't he supposed to have much experience on polishers?
why he uses this machine in terribly way, I am confused too
washer mod?
the regular rupes plate and machine are tightly connecting together. when you do polishing ,the body itself and the center spindle will hold the vibration and hand pressure or any weight unbalanced . but when you have a spacer between,the ceter spindle will this mostly heavy job...
I was planning to have a rupes 21 for my Christmas gift but after I saw this video https://www.youtube.com/watch?v=RwHh0tT0BLM, I am very disappointed because about 1/2 time, the pad seems like stall or rotates very slowly. My duetto works way better than that. It will stall on certain panel...
there are special polishing pads and powder for granite,I dont recommend this method,maybe it works for your countertop,but different material,different texture
I have PF2500 ,FP4000 and 85RD
But I always use 85RD or FP400 once or twice a year to polish out swirls and minor imperfection. Pf2500 is just too much aggressive if you use once a year!
pics taken right after sonax BSD
My routine in this winter
ONRWW
sonax BSD, average durability is 1.5-2 months
base coat is Klasse AIO+SG layered about 2 months ago
my another favorite is jett terigger,but this time I will give sonax a try
I think rinseless wash strip wax or sealant. I tested FK1000p,Dodo juice SNH 3 or 4 months ago,just couple of days ago I made another test on klasse SG. After ONRWW, initial beading or sheeting is ok,but not like before the wash.But only after one or two rain,it's all gone.