Squadron Green Putty works really well on small gaps and join-points on models. I find it much easier to use than traditional green stuff for this kind of gap filling. However, if you are wanting to do any sculpting with this putty stuff... DON'T. It wont work for that. If it's just filling in a smooth gap. It works great. Like I said it sands down really quite smooth and only takes about 30 minutes to fully dry.