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Hey so I have been sculpting and when using greenstuff there is always very slight bumps "nearly invisible" but annoying and areas where I can see where the 2 greenstuff meet. Well I know you use sandpaper to get rid of this but I was wondering what grade of sand paper do I use?

I would start with the finest grade of "wet and dry" paper, as Green Stuff is fairly soft.

Most hardware shops sell selection packs with a couple of sheets of each of the useful grades, or you can get it from Amazon these days.

There shouldn't be small bumps in greenstuff unless it's not mixed properly or you have bits that have already slightly cured before you start mixing.

If you're using GW greenstuff or similar where the blue and yellow parts are joined as one strip, you often have to discard the middle bit where they join because it starts curing together after a while.

If you're getting fingerprints, you can smooth them out before it cures, do your sculpting, wait an hour or so, the greenstuff will be more firm but not completely cured, so you can just gently work out fingerprints and stuff.

I didn't have much luck with sandpaper on greenstuff. But there should be some REALLY fine grain stuff that would do the trick. I usually solve that problem now by keeping a smoothing tool to work with GS. (Usually a wet toothpick or paintbrush handle.)

Yes rubber tipped sculpting smoothers should do it

Yes, unfortunately Green Stuff does not sand well. However, "the wine is drawn and it must be drunk". Fine grade wet and dry is the least destructive way to address the problem. Very careful knife work with a scalpel might help too.

The rubber tip shapers are very good. I have a set myself. They only work on putty that is still pliable, though, so it is something to bear in mind for the future.

You can also can curved scalpel blades which you can use to very lightly scrape the GS to smooth it out. Polish with your finger (as it's slightly greasy) - this will show up areas which need more work.
As already mentioned, never use the the bit in the middle of strip GS, use a rubber tipped colour shaper & if you're doing a lot on 1 mini don't try to do it all at once - do it in small bits / layers & built it up. Look at the WIP pages on the Hasslefree site to see what I mean (http://www.hfminis.co.uk/# when it's back up & running that is!!)

400grain is what i always use.

I've used very fine wet & dry paper as well & it's OK. Sometimes I've super-glued a piece on the end of a sculpting tool to get into all the nooks & crannies on both GS & the actual mini.
Have also mixed GS with Milliput which creates a harder finish which can be more easily scraped / filed / polished smooth.

Wet sanding is great for ultra smooth finishes. It's most common in the automotive industry - and for good reason! With that said then, I find some great ultra-fine sand paper in my local automotive shop. For me, that's Halfords.