http://www.amazon.com/Elastomeric-Roof-Coating-63-600-5-Kool/dp/B001B1CHLW works fucking awesome and it repels water, mildew, dirt and cleans very easy. Not sure if it off gases toxic vapors though but seeing as it is meant to take heat and I never noticed any plastic/rubber after smell it dried (normal paint still smells much longer, I think it seals itself) seems very stable at 70-90̊̊̊̊ degrees F.
I have a love/hate relationship with Mylar. Does the job but not very reuseable and can tare from time to time. That's why I am going to be buying a grow tent soon.
in my opinion mylar is garbage. all it does is wrinkle up and rip.. like jasondanzig said panda film is the shit. heavy duty and nearly just as reflective also is light proof
Yeah, it's all about the Reflectix. Reflective, water resistant, and it insulates too. It can be a bit pricey to install, but it lasts for a long time. Cleans easily.