sunroom insulation

[cdrechsler]

Hi Team!

I’m about to start a project of insulating our sunroom that gets extremely hot in the summer time. 
I don’t want to spend a whole lot on this as it is a rental and we won’t be here forever. 
My idea is to use Ametalin thermal liner to line the underside of the metal sheeting ( I’m guessing it’s colorbond sheeting) 

I’ll unscrew all the sheeting and then just lift the sheets enough to slide the thermal liner underneath, adhere it with something ( double sided tape or liquid nails?… suggestions please?) and then screw the sheets back down to also hold it in place and then use the Ametalin insulation tape to tape all the seams up so there’s no flappy gaps. 
does this sound like a good way to go and would it give adequate temperature reduction?

thanks in advance