without knowing what is your application for UV intensity, as doug  
said, hard to select.  If just the UV you are worry about, you can  
use $$ - PTFE might be your best bet if money is not issue... https:// 
www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=13871
Application is key: to prevent IC - a bit thicker molding compound  
would work (UV erasable type), even just a good piece of tape.  it  
either protected by UV blocking (molding compound) or UV reflecting  
(mirror like coating).  Exposure time, intensity also matters as well  
as type of UV - A, B, or C.  with presence of other lights.  IMHO.
Good luck.
jk
On Feb 10, 2021, at 11:09 AM, Richard Kraszewski wrote:

> Anyone have a clue as to what  type of coating that would be?
>
> Rich  Kraszewski
> Plexus Senior Staff Process Engineer
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