Both sides are mylar. It's reflective on both sides. Its strong and durable. I've re-used this mylar on both sides of my indoor greenhouse where I grow tomatoes and perennial flowers.

How thin is this in mils? 2mil? 1mil? 1/2mil? 1/4mil?

THE FILM IS VERY THIN AND CAN BE SEEN THROUGH IN CERTAIN LIGHT. It is good to keep hot sun out of the sunroom windows.

Dose it reflect all the light spectrums even the ones we cant see

Mylar won't reflect invisible wavelengths except super short infrared. So it will help warm up the plants

I wanted to pin this to the wall, flat and use it for a film, does it lay flat on the wall?

This comes folded into 3" x 4" packs. I think if you unfolded one, let it sit out for awhile until the folds relax, it should work, especially if you pinned or taped it around the edges. For $10.00 it's worth a try :)

ASIN	B00B8PAAJW
Best Sellers Rank	#10,906 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #13 in Plant Covers
Brand	NAVAdeal
Colour	Silver
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 1,738 Reviews
Inner Material	mylar
Item Weight	0.02 Kilograms
Manufacturer	JIUFAN
Manufacturer Warranty Description	no warranty available
Outer Material	VMPET
Outer Material Type	VMPET
UPC	519094156314
Unit Count	53.52 Square Feet

NAVAdeal Silver Reflective Mylar Film- 82 x 47 inch Set of 2- Garden Greenhouse Covering Foil Sheets, Highly Reflective, Effectively Increase Plants Growth, 100% Environmentally Safe ,,

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