Aluminum foil? That might be great, IF you are using IR to cure the part as it would reflect the IR waves (although the part would still heat soak into the seals) but I doubt it would make much difference in a convection oven. For what little trouble it would be, why not just pop out the piston and change the seals or at least inspect them? Otherwise, the risk of brake fluid leaking out and ruining the coating just seems too much for my liking.
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