Can heat treatment repair damaged paintwork?

I have a two-year-old blue metallic Volkswagen Golf Plus, which has developed whitish patches on the bodywork. My Volkswagen dealer tells me that these patches are caused by hand or sun cream touching the car, causing the glaze to be damaged. They say they can correct this using some form of heat. Have you ever heard of this happening?

Asked on 27 October 2012 by MR, Sherborne, Dorset.

Answered by Honest John
Yes. Heat treatment of the clearcoat lacquer can also remove the residual effect of birdlime. Experiments by Autoglym revealed that the damage to clearcoat by birdlime is caused by the difference in surface temperature between the covered paint and the exposed paint.
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