We got a kit (pawmetto ent)to do the zink phosphate at home. You heat up the water to around 200 deg and mix in the zink phosphate and then dip the prepped part to darken it. How do you heat the water and keep it heated for larger parts ?? I think a hot plate and a stainless pot will work for the smaller stuff but what about larger parts that are way to big for a pot. Were thing a plastic drum but how would you keep the water heated to 200 deg while the part soaks ??