Going to use Commercial server rack

Hi everyone, I am going to be using a Commercial server rack for my new grow adventure. A little over 6ft tall and 4ft long and a little over 3ft wide.. It is black inside and out..should i paint it white on the inside and if so, what color white.. And then will that be good enough for reflection.. In my small PC case, I used some reflective insulation, very thin stuff.. Would the paint be better?
Thank you for help and advice in advance.....

Should i have posted this in the micro grow area?

I had to Google commercial server rack to see what one looks like. It looks like it would work with one small problem if it's made out of metal. The metal will absorb the heat and make it quite hot in there. I could be wrong, give it a try.