Where can I get do it yourself spray on radiant barrier.?
For one you need to google roof vents attic vents to learn how to get the heat out of your atticIf you plan on staying there a long time ,plant some trees to shade it from the afternnoon sunGet some shutters that you can close to cover the windows that the sun shines onGoogle attic insulation and read all about itand wall insulation
What type of radiant are you wishing to create a barrier for? Sunblock is a radiant barrierSo is paintIn fact, pretty much any substance will have some radiant barrier propertiesAnything opaque and shiny will generally be the best For attic decking I would just purchase rolled insulationFor spray fill insulation Home Depot will loan you a machine to blow it inFor two-part polyurethane you can rent a machine, but it is messy.
