It's a lot more aggressive.
M105 is a true cutting compound. M205 is a fine cut polish.
4 categories that any compound or polish on earth will fit into,
- Aggressive compound <-- M105
- Medium Cut Polish
- Fine Cut Polish <-- M205
- Ultra Fine Cut Polish
(See pages 92 and 93 of my how-to book)
Keep in mind these two products for formulated for, targeted at and marketed into the refinishing world. Refinishing means your local body shop where after Joe Consumer gets a fender bender on his Honda the replacement fender is repainted and "sometimes" sanded and buffed.
If it's sanded and buffed, M105 was intended to be used with a wool pad on a rotary buffer to remove the sanding marks. The abrasive technology in M105 is such that it will finish out damn near like a fine cut polish. By historic standards simply amazing.
Now with the above in mind, that is a compound that will finish out like a polish, when properly used all a body shop tech would need for follow up after the M105 compound would be a fine cut polis with a foam pad to ensure there are no holograms left by the fibers of the wool pad and any residual holograms from the compound/removed paint.
It's a one-two punch that afterwards the body shop tech would hand apply a glaze like #7 Show Car Glaze or 3M Imperial Hand Glaze and kick it out the door.
The fact that these two products are incredibly popular in the reconditioning world, (reconditioning means the detailing world), is a by-product of the performance of these two products and the fact that good products can't be kept isolated to a single industry with this thing we call the Internet and specifically the medium we call discussion forums.
