I've been powdercoating a lot of my engine bad parts lately. They are coming out great. What I need to know is if baking the powder onto a brake booster will hurt the rubber seals/diaphragms inside? Also are there any rubber seals inside the proportioning valve to worry about? I think it's all metal but just want to make sure.

As an FYI I would be baking the booster under a heatlamp and not in an oven so it would minimize the heat absorption I think.

 

Use low cure temp powder and you should be safe.