I don't know if you saw my thread about the poor grower version for mylar, but I did decide to get the 2 mil mylar...
however a friend told me it checked his area with a light meter and found the flat white paint did a better job at reflecting than the mylar ....
.... after I paid $26 for 25'. Oh well .... it looks pretty anyway .... so I would say it's up to you .... flat white paint is inexpensive, easy to clean and according to my friend reflects the best. You can get cheap mylar now with the gift wrap going on sale at half price the silver mylar in gift wrap .... I paid $3 full price for 55 sq. ft.

Hope this helps :rastasmoke:
:noel: