I use the method dobie and irishthump mention.
To elaborate a bit, and save you some frustration- I'll go over the basic process I use.
First I get some plastic rod at the hobby shop(very few game shops carry this stuff- need a regular hobby shop that does at least models &
RC stuff). Evergreen or whatever brand they carry is fine.
I usually use .8
mm or so for regular rivets, up to 2
mm for fat ones.
You can use square rod or round, its not a big issue with tiny rivets. I prefer square- as its easier to slice since the rod rolls less when cutting.
Once you have your rod- get a brand new xacto blade, and a soft cutting surface(if you cut on a hard surface the rivets are prone to fly off more often).
If you are right handed- place an empty box just to the right of where you are cutting- standing up on its side- a rhino box is about the perfect size. This will catch almost all the fly aways you might have.
Now- the cutting. Imagine the plastic rod is like a lil loaf of bread- and you're trying to cut it into tiny little slices. Use the middle/back of the blade only- not the tip (you'll see why later) It takes practice, but just put on some good tunes and start cutting. Ideally you want flat little disc shapes- if you cut one too long- pick it out and toss it in your scrap plastic pile(which you can use as rubble for bases!)
Once you get good at this you can slice up 12" into rivets in about 15 or 20 minutes- to store your rivets I'd recommend an empty paint pot, or something similar with a lid on it- spilling the rivets on the carpet is bad- as theyre gone
lol.
To apply the rivets- that shiney new blade you used to cut them is used again- this time we just want its super pointy tip. Gently stab a rivet- just enough that it sticks to the point. Now, on a scrap piece of plastic(I use a flipped over base as a lil bowl) put a few drops of
CA glue- make a lil puddle so it doesnt dry right away.
Now- dip just the tip of the rivet on your knife into that lil puddle just enough to get a lil glue on it. Look where your rivet goes- and gently press it on- count to 3 (letting the glue set) and wiggle the xacto a lil to work the tip loose and pull it away. If all went well- you have a rivet!
Tips- too much glue makes it take longer to set, and can obscure the rivet. not enough means it can pop off later (sucks if its been painted). Poking it too hard with hte knife might make it stick to the blade during the application part. And not poking hard enough means the rivets will fall into the glue puddle. Also- make sure the glue puddle doesnt get too tacky or it will eat your rivets off the knife tip
This might be easier using just plastic cement- but Ive never tried it. If anyone has- post up how it worked for you