I've used mylar to cover my grow cabinet but can still see light from outside through the gaps in the cabinet. Is there anything that will sort this out in one go? More mylar? Aluminium tape? Other tape? Anything else?

I'm also going to be making some holes for the electrical cables. Again is it just a matter of taping mylar round the wire or is there a neater trick?

Any help appreciated.

If it's light leaking around the edges, B&Q sell Black Plastic 25mm angle in 2m lengths for about £3 a go, stick this on the corners...it works and looks good. Failing that...black Gaffer Tape works and it's cheaper as well

Thanks, I'll give that a try.