Using Mylar outdoors

Is using mylar (boPET) useful outdoors to help the plants catch a few more rays in areas that don't get a lot of light? I'm not worried about the reflective material giving them away - these babies are secluded amidst thick bramble and off of a slope, so if someone finds them, it ain't the mylar giving it away!

Has anyone ever used sheets of mylar for an outdoor grow?

The benefit to risk ratio is fairly awful in this scenario. Find a better grow site. Get out "in the yonders", then go even further out. Full sun preferred.

i believe its better to have em hidden, then get direct light an get em found, ( but i plant em both ways lol.)
In mid summer here its so dam hot that shaded areas are better (100 plus for a month)

I have flowered in big as Lilac bush i cut a few branches off over the plant an it did fine.
I have done it in cornfields an they just get overhead light an do fine.

Mylar is risky

Camoflage the hell out of em an bushem out. If you cant hide em you might not get to keep em.
Dont put all you eggs in one basket either, 2 to a spot space out to cut losses if somthing happens to one.

i am pretty sure that moisture degrades the reflective properties of mylar rather quickly