Hey i was just wondering what name brand stores (like Lowes, Home Depot, ect) carry Sintra PVC Sheets? For anyone out there who doesnt know what im talking about, think plywood sheets, but instead of wood its PVC/Composite. im trying to make a custom sith helmet, and i know how to make it, what measurements i need and what materials but i dont know where to get the sintra. also, would PVC/Plumbing Silicone or JB Weld be better for securing the seams (aside from the usual rivets ect). Thanks in advance to anyone who can help..