HerGracious, I don't use marzipan with sugarpaste, only with royal icing, so I don't know, sorry.
It doesn't stop modelled paste from sticking together though. I've used it plenty of times and not had any problems with modelling. I usually use water to stick sugarpaste as well, but do use edible glue for larger pieces that are likely to be subject to a lot of gravity pull, iyswim.
I want one of those American 'The Mat' icing sheets that you can use to roll and flip sugarpaste, but they are ridiculously over-priced for what they are. I've never got on with using clingfilm, but then clingfilm and I are old enemies as I can't seem to handle it without getting it all either stuck to itself or ripped in the wrong places - and I always lose the end of the roll. 
Tinkerball sorry, I can't remember where I got mine from now, but it was definitely an online sugarcraft supplies shop. The silicone has enough grab to stop the sugarpaste sliding around as you roll and so you can lift it onto the cake, but you can still lift it off and reposition if you want to. I like the fact mine has printed guides/measures for sizing up the icing as well - makes life a lot easier.