Yup M105/205 are nearly the same as Ultimate Compound/Polish.
A little less cut with Ultimate Compound, but it has a longer work time and lower dust. If I could get it in a big bottle it's what I would use all the time.
As others have said it is well worth the money to pick up a good DA. You'll get better results in a quarter the time than by hand. My recommendation is always the Griot's Polisher but many here like the one from HF. The Porter Cable 7424XP is probably the "industry standard." With any DA I prefer 5" pads over 6". A little easier to work on curves and more power goes to the pad.
Using a DA with a good finishing pad and M205 will make a mirror and you can go straight to applying a sealant.
A little less cut with Ultimate Compound, but it has a longer work time and lower dust. If I could get it in a big bottle it's what I would use all the time.
As others have said it is well worth the money to pick up a good DA. You'll get better results in a quarter the time than by hand. My recommendation is always the Griot's Polisher but many here like the one from HF. The Porter Cable 7424XP is probably the "industry standard." With any DA I prefer 5" pads over 6". A little easier to work on curves and more power goes to the pad.
Using a DA with a good finishing pad and M205 will make a mirror and you can go straight to applying a sealant.