The challenge you are going to have is the fiberglass insulation contains tiny air pockets by design and these air pockets hold moisture (as any air does). What you don't want to do is have a vapor barrier on both sides of this insulation since any increase in moisture will have no where to dry...
I also would steer away from a double vapor barrier (mold sandwich). The comment "if it's dry in the area between two vapor barriers, it will remain dry by definition. No moisture can get into the area." is disconcerting to say the least.
I agree with the above. For low ceilings you want the light dispersed among as many fixtures as possible. Could even look into something like rope/string lights for a move even coverage. I know that might not give the look you want though...
+1 for what the others have mentioned. Imazapyr is the most common ingredient apart from the glyphosate. (TVC) total vegetation control posted above is what I use.
@Stelzer My understanding is that grinding is the recommended prep - do you have and good details on what type of grinder or discs to use? My slab has some miscellaneous debris like paint overspray that would need to be removed so acid etch is out of the question.
Wow great responses - I really appreciate the info. I will not be going with a home center product.
The product I saw that caught my eye was the below but I'm thinking they are just trying to capitalize on the 100% solids claim...
I know there is a lot of knowledge in this forum so I'd love for somebody to help on this. I know the common consensus is to ignore the home center store products (trust me I get it) but what specifically is different between an 100% solids epoxy product sold by Lowe's/Home Depot vs some of the...