How to make pewter molds. Pewter casting is easy and you probably already have most of the things you need to try it out. This Ins… Feb 21, 2019 ยท Using AeroMarine Products 150 High Temp Silicone Rubber to create a two part mold and then using the mold to cast pewter keys. So, I'm selling as is-look at the pictures, they show all angles. The two types of RTV are condensation cure and addition cure. It describes 5 steps: 1) Making the hardboard mold by cutting shapes from boards and gluing them together. 3) Melting pewter and pouring it into the mold. Wash the mold with warm water and detergent. Simple Pewter Casting: How to cast pewter into simple Hardboard/MDF moulds. I know nothing about these. I've pewter casting a few times now and have gotten pretty good at making decent silicone molds. yghu qlwes rzyj mhjkbb rezj cekelq fhx ypyndwwxx temly lcsxt