Homebrew PCBs

>From what i read polycarbonate is filtering out UV and PMMA is 
>passing everything straight through. I may be misinformed though.

Either can be formulated to block UV. 

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Tuffak® XL Weatherable Polycarbonate Sheet

Tuffak® XL has a "built-in" UV barrier and is 100% polycarbonate.
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Plexiglas® UF-3, UF-4 and UF-5 Acrylic
Some applications, such as document and fine art preservation, call 
for a material that absorbs more ultraviolet (UV) energy than 
ordinary glass without absorbing visible light.

Plexiglas® G UF-3 and Plexiglas® MC UF-5 standard and non-glare 
acrylic sheet finishes filter out up to 99% of all UV rays, as well 
as some visible light
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--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@...> wrote:
>