If memory serves blacklights are UVa and the UV that causes fade and weathering is UVb, the same UV found in tanning booths in a higher concentration than the sun without the melanoma effects. ha, you could rent a tanning booth for a few hours and that should do it. there are a few clear coats that have major UV blocking properties, that should keep what you want faded faded and the rest like new for a few years. its a really cool idea i must say. best of luck.
Dustin D