That 3m 77 spray glue will not come off the walls,and yes repaint and spackle
the walls.You can get 1/8" hardbroad {masonight} and glue the mylar on it.
You can get it in 4'x8' sheets at homedepot or lowes or any lumber yard.
Then use double face tape and stick it to the walls.Much easyer to get off the walls and put it some place else too.
Peace
crazywill Reviewed by crazywill on . Mylar Question Does it have to be completely flat against the wall? i have it taped up and i didnt try and flatten the mylar out, its really loose and moves when the fans blow on it... and now that i think about it, it would probably reflect more light if layed flat against the wall... any opinions on this? Rating: 5