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Yes, in most cases. Silicone handles curing temperatures without melting or losing its shape, which is why it's the standard for masking holes and studs.
How many cycles you get depends on your oven temperature, how often they're stripped, and how much coating builds up on them. Many finishers clean and reuse plugs until they start to tear or lose their grip.
Keep a stock rotation going and bin any that have split or stretched. A worn plug that lets powder creep into a thread costs more than a new one. Hadleigh supplies silicone caps and plugs in a range of sizes.
For more information on Are Silicone Caps and Plugs Reusable After Powder Coating? talk to Hadleigh Enterprises Ltd