u/Soft_Confidence_3883

I'm planning to get some custom sized dimension (~4x3) for double pane, tempered glass windows, building cedar boxes, and then setting the glass inside.So basically get the cedar and make perfectly square jamb boxes. Set them in place with shims. But I have a question about the gasket material - what is the best gasket material, especially for the bottom/heaviest area, what is the best compression gasket material?