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If you are sure that this is a specific reaction to the coolant, it would be best for him to use a protective barrier on the skin area/s exposed, i.e. for the hands/arms: disposable latex gloves (elbow length if necessary);
if it is an allergic reaction, this should treat and then reduce the symptoms.
If he does this and the symptoms persist, he should see his doctor or dermatologist.
Good luck.
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