There are several methods, one of them is to leave the calipers on while spraying it using the high heat resistant spray can. Another method is to completely remove the entire set and send it for spraying at the paint shop. Some tyre shops offer this service where they send it out for you. Try hupshoon at Sunway, price wise will depend on how many callipers and the size. You can also try KS Brakes at Sunway.
Personally I would recommend powder coated high heat resistant paint. I have see. A lot of callipers which develop bubbles around due to the high heat when braking
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