Im using a white heavy plastic to line my walls for light reflection. Is Mylar better? Paint? What is better?
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letās see what others think 
Flat white is the best option, I think.
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Iāll chip in my two cents on this topic:
I love Panda Film (5.5 mil B&W poly) for lining walls. I have built large facilities using Panda Film to break large warehouses into individual rooms. I use it to line solid walls with a clean plastic surface that can easily be sprayed and washed down. Itās cheap and easy to hang. Itās even easier to tear down. Itās great for commercial and home grow applications.
Happy Growing 
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Thats what Im using nowā¦I have used mylar in the past and find it hard to work with (in smaller areas)ā¦Ive heard its easy to get āhot spotsā from it as well, but its very reflective
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Plain flat white but mylar will do fine.
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I love Panda Film as well.
And also like flat white paint.
If using fluorescent, or most types of LEDs, you wonāt have a problem with āhot spotsā from ālensingā.
This is kind of like burning stuff with a magnifying glass, and as with large telescopes, you donāt need to have the light pass through a clear material like glass, you can use curved mirrors.
HID lights that produce a lot of āheatā/IR in their spectrum can cause this actual burning type ālightā burn because of a ālensingā like effect.
Happy growing,
MacG
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I built my veg room out of polypro and I love it. It wipes down easily and never have a mold or mildew issue. Itās sturdier than panda film. Itās a form of inso board and only costs 10$ for a 4x8 sheet. So for 70$ And some gorilla tape u get 4 walls and a ceiling and have a 4x8 room.
I was told by a few people u canāt build a room out of it but so far I have found them to b dead wrong.
Happy growing and welcome to the forum.
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Iām liking the reflective liner you can find in the insulation isle in Home Depot. It also has small bubbles in it and can be cut with scissors or knive. Tapes up fairly easy with silver duct tape for a sealed room.
Ceilings and walls. Good luck.
Itās light weight as well. User friendly
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I know this is a few days old but I watched this video a while back that shows the differences between surfaces on grow rooms. I found it interesting. Hopefully itās ok to post a YouTube video? @macgyver_stoner if not ok just remove and Iāll type up the short version notes.
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The video kind of settles it. 20% increase in releflection when using decent reflective mylar. I still go with matt white paint. Its the easiest to maintain and clean.
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I just got some egg shell paint the other day. Iām about to shit down the grow and finish my rooms for the summer heat coming.
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Whit microbial paint