Standard Yellow-Grey 2-Part Self Hardening Putty

First time making sandbags was very easy, just watch the youtube video for this product.

Really easy to work with. You can sculpt and shape it with different tools or even your fingers while it's fresh, and sand it to fix imperfections when it's hard. It's also relatively light, which is an advantage. Highly recommended!

I've been using this epoxy for about 8 years now. Use it for just about every model I've built in that time. Great for filling gaps but I use it mainly for sculpting and modding figures. Make sure to mix parts as evenly as possible so it dries and cures well. Also keep your hands clean in order to make it easier to sculpt. It cures in about a day or overnight and can be filed, sanded, and polished until as smooth as styrene/plastic. You definitely need this in your tool box.