I still get a good laugh at reading some of these posts on the forum, the old trowel finish v sponge finish, I find it hard to believe there are still some plasterers out there that dont like the sponge or wont use it, but I know plenty of very good spreads that wont use it, the sponge wins almost every time for me, the only time it dosent win for me is when its used on knauf skimming, or in very small areas, pipes plugs where you cannot get the sponge in
For people that want to get into using a sponge dont forget there are generally 2 kinds of sponges, 1 rough and 1smooth I use them in different ways
when working alone I would knock one bag to one and half bag mix of multi on a re skim, this for me is usually comfortable,I would 2 coat and use the smooth sponge, the difference is the smooth or finishing sponge, tightens the skimming in better,but it takes longer to rub up,and this sets it faster, and in my case I can get away with 1 less trowel if I wanted to
now for the rough sponge, I use this when putting a bigger batch on, that is one and a half to a two bag mix of multi,this is my max, still like to 2 coat, get two thirds on on as quick as possible then rough sponge, then get the other third on, it can be sponged very quick using the rough sponge, and this seems to hold the skimming back giving me plenty of time to get over the bigger batch, it works fine for me
as for the better job, if your a good plasterer there should be no difference, trowel finish or sponge finish, 1 coat or 2 makes no difference the 1 or 2 coat in my case is only down to setting times its just I prefer to 2 coat, well really its just one coat and a lay in 80% of the time to make life a little easier nowadays, 10 years ago it would have been 1 coat 80% of the time
it comes down to, for me, the sponge can knock 1 hour off a 6 or 7 hour room, less stress on the elbow, and just makes skimming that little bit easier