Well all i have to say is that when building my rubbermaid grow this was the biggest problem and a big pain in the head... if you look at the first pictures of my box you can see that it was whitehow so? not having used a Rubbermaid container, i am not arguing, i just want to learn why... i have been a big fan of white paint over mylar for a loooooong time and never seen a down side to using it.
the rubbermaid plastic has a shine on it, so you have to use plasics paint on it but it doesn't really stick to it well... the type of paint also comes off when you put ducktape on it... so you get into situations where the paint peels off a lot
when you move the container the paint will flake off as well
after you put on the first coat you realize that the rubber draw in tons of the paint, which is normal for plastic but it takes between 2 to 4 layers to get it white enough that you can use it to shine off the light
finally it never really loses the paint smell, even if you go close to it you can still kind of smell it... it takes about 3 days to fully dry and about a week to get the smell out enough to use it
like even if you fix all these problems, its just not worth it when you can just stick on mylar