Here is the caulk I use. It is water based, so clean up is easy. I buy it at Family Dollar for $1 a tube. I’ve done about 4 or 5 sets of limbs. I used it to seal hair for the first time, and I love it. It dries rather quickly, too.
Clever you! Do you clean it off level before you let it dry? Or, does it sink in as it dries? Once dry, is it waterproof (guessing so if you used it to seal hair- but just checking.)