Could it be used in a grow area

Mylar film isn't that expensive for a small bit like that,
Plain matt white paint is probably best for effect vs price.
 
Iv read studies that FLAT white pain is far better reflector than tin foil and such. True milars right up there but its cousin tin foil just aint the same, cheap white flat paint, hell 98 cents gets u a spray can of it at wally world...
 
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