What can i used to fill small gaps?

Guys what are you using to seal small gaps when making molds. Say the edge where you are making a flange. I tried Clay but it’s a ton of work. Anyone use something else?

Filleting wax.

Thank you. I was guessing but didn’t want to spend money guessing

if you cannot find filleting wax, plasticine will work too.

I just used plasticine on my mold flange. worked but I am going to buy some fillitin wax, seems to be better

Filleting wax is just leagues better. Used to use plasticine but it’s a lot of work to get anything close to a decent finish. Wax takes 10 minutes. Hugely valuable in saving time.