2nd choice with low residue no-clean (or no residue type).  (or  
installed using laser soldering... if it is not one offs).  IMHO.
On Dec 1, 2017, at 12:08 PM, Graham Collins wrote:

> Hello Technet!
>
> Wondering what other people are doing with this dilemma.
>
> We have had several customers design in pre-built RF modules on  
> their boards.  I totally get why, it is a pre-built, FCC approved,  
> easy solution - the fastest way to get a good Wi-Fi or bluetooth  
> solution.
>
> Where things go off the rails for me are where this is used in a  
> high humidity application (e.g. a marine setting).  We strongly  
> prefer to wash boards, we can build no-clean if needed but I'd  
> prefer not to for an on the water use.  But the part a customer has  
> designed in specifically says not to wash it (it has an EMI shield,  
> so they are properly concerned with water entrapment).
>
> So - would you:
>
>  - build it no-clean?
>  - leave the part off, build and wash as usual, install RF module  
> later using no-clean?
>  - wash it (and maybe bake it to dry it out)?
>  - ????
>
> --
> regards,
>
> Graham Collins
> Senior Process Engineer
> Sunsel Systems
> (902) 444-7867