Best way to fill big gaps in grow room

I have some large gaps to fill near the light that I am going to use in my grow space - 600 watt HPS. I am doing this under my basement stairs - it's the only place that would work. So, the angles and corners make it hard to cover with wood. I was thinking of just covering them with a layer of 3 mil plastic. The plastic would be about 6 inches from the outside of the reflector. Does it seem like this would get to hot for plastic? I have mylar I can use too.

Thanks for any help.

so are you trying to block the light? I don't get it.

Block light and smell from leaking out.

Get a few fat chicks to stand in front of the cracks to block the light

can u take a pic of what u did so far ?, are you talking about light coming throguh the stairs or out the sides ?

hey man foil tape @ wallyworld is 7 bucks and will seal just about anything.m2$

korvette1977 said:

Get a few fat chicks to stand in front of the cracks to block the light

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That wouldn't work. I would eventually have to feed them.

420weedman said:

can u take a pic of what u did so far ?, are you talking about light coming throguh the stairs or out the sides ?

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I think I got it pretty well sealed up now. I attach a picture anyway. It is kind of a messed up space to have to grow in. but, its under the stairs or no where.

little cracks and shit like that i filled with "great stuff" in my room ..expanding foam bought at HD

well man jsut get some panda plastic and attach velcro to it so it seals and then you can unseal it man to get to the plants ya know.then it works as a door and seals it man.