/diy/ - Do It Yourself

sup anons.

I made pic related UV exposure box out of alfoil glued to cardboard. It is as shitty as you'd expect but it got the job done till the adhesive gave up due to constant flexing and it all fell to bits.

I want to replicate it with ply and paint, but I don't know what to paint the inside with. My gut says white (because reflects all wavelengths, including, presumably, those either side of visible.. not that the internet can decide one way or the other), but I have found a chrome paint that with decent surface prep and a 9001 layers can be sanded and buffed to a highly reflective sheen (as in reflects a torch light much like a mirror). It is however somewhat expensive. Does /diy/ have any thoughts or experience?