light reflectors

In the last week there was a question of the value of the aquarium store 
flourescent tube external reflectors.  Since I am setting up a lighting 
system for a 45, I was in the hardware store looking for stuff this 
weekend.  I have two ideas for a reflecting backing.

 - white vinyl flooring.  cheap, waterproof, easily installed

 - tin foil. even cheaper, but not very structural, difficult to work with.

Just wanted to share ideas with the other cheapskates.