Hopkins wrote:
> I have purchased RS Components Aerosol photo resist 198-9651.
>
> They suggest that I need to use a there "Universal Developer" 690-849. Is
> this really needed as it is expensive.
>
>  I thought the UV light exposure would soften the photo resist enough
> for etching - but  if this is not the case then what does exposing to UV do?
>
> I was just going to use the photo resist then etch it.
>
> *************************************************
> Roy Hopkins   :-)
>
> Tauranga
> New Zealand
> *************************************************

The UV does not soften the photo resist, it hardens the exposed photo
resist. You need some sort of developer otherwise the etchant will never
get to the copper.

--
--
Martin Klingensmith
http://infoarchive.net/
http://nnytech.net/

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.