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Im making a conversion for one of my land speeders and the green stuff looks like poop. Im having a hard time smoothing it out. What tools are good to use to have a nice smooth finish?

You could try and use a fine grit sandpaper in combination with normal files. File down the rougher spots until it is even. Then use the sandpaper so make it smooth.

If you mean getting the GS smooth during sculpting the secret is to not get your tools stick to the GS and smooth it with that. You can use water for that, saliva or vaseline. I lick my tools as saliva isn't as flowing as water and can be easier removed than vaseline.
As far as tools go clay shaper do a good job but also just a wet finger does wonder in smoothing out GS.

Alright sounds good, thanks for the info!

Just a warning, once I figured out this, I didn't think that it would affect the stickyness of the green stuff.

Make sure that wherever you put the green stuff where you want it to be first (And make sure that it is completely dry at this stage), THEN use water!

I've also found that just my finger and skin oils will help. Somewhat like we were taught to apply to musical instruments in a pinch in school. Even the. Cleanest person has oils around their nose. Works well, no special tool necessary. Though I did get a set of various sculpting tools from Harbor Freight which work well where my fingers won't.

'btldoomhammer' knows wheres its at his gs work is da bomb!
But my 5 cents: Wet the tool and use as few strokes as possible, if you need to over work the green stuff i find rubber cue tipped brushes for sculptural painting, charcoal, oil smudging and palet knife work are great for this job too imo.
I use these along side wax/clay carving metal tools.

ps these look pretty chucky which may be good for large areas but the ones i use are pretty tiny which i prefer, more like this.

For ultra-flat surfaces I use a small metal ruler. Apply a bit of vaseline for non stickiness and it gives an almost perfectly flat surface. I used it to get the following finish

I'll just add one thing to everything posted above.

With green stuff you may want to do two passes with smoothing. Do your basic shape and detail, smooth it a bit and let it sit for 10 minutes or so to firm up a little. Then go back and do another smoothing pass on it. When it's too soft it can be hard to smooth it without wrecking your work, so letting it cure a bit between smoothing passes can help that issue.

 Zognob Gorgoff wrote:

'btldoomhammer' knows wheres its at his gs work is da bomb!
But my 5 cents: Wet the tool and use as few strokes as possible, if you need to over work the green stuff i find rubber cue tipped brushes for sculptural painting, charcoal, oil smudging and palet knife work are great for this job too imo.
I use these along side wax/clay carving metal tools.

ps these look pretty chucky which may be good for large areas but the ones i use are pretty tiny which i prefer, more like this.

These are called clay shapers I'm pretty sure. I only say that because, I tried to find them once for the exact same reason and couldn't figure out what they are called.

They're either called clay shapers or color/colour shapers, depending on whether they're being marketed for sculpting or painting/pigment work. Same tools, either way, and great for smoothing. That said, I do most of my smoothing with a wet finger, once the putty has firmed up a bit. The silicone tip of the shapers has a bit of give, which allows it to function like a smaller version of your lubricated finger - great for finishing work in tight spots, but too fine for more general work.