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Obviously this depends on the conditions and what you're hoping to achieve. I personally prefer FG400 because I feel like it has a longer working time and a stronger finish. I also feel like m105 dusts a lot.
Either way, I have both and have used both. They both produce nice results. I suppose you could "finish" with FG400, but you really do want to follow with SF4000 or SF4500. I don't think I would want to finish with m105.
My opinion, of course. (GG, Rupes 15)
I switched from m105 to fg400. I like fg400 with my 3401. But you should also look at m100. I plan on trying that next.
I think you mean M101, not M100. M100 is for wool on rotary applications (not that you couldn't get results with other systems). M101 is for any pad on any machine.
But I completely agree that FG400 vs M105 isn't the best comparison with more recently available offerings in the US from Megs.
I have both, but I have a lot more FG400 in stock, if that tells you anything. The one bottle of M105 that I have still has a lot of product in it. I have to keep replacing the FG400.
HUMP
Actually this is a moot conversation. Technological advances in wet sanding will soon render harsh abrasives and pads obsolete. I am a firm believer in the 3M 3000-5000 Trizact system. Soon 6000 grit papers will be available.