Homebrew PCBs

Alex,

I just bought some spray on photo resist. They say to spray on a thin coat
and then put the board, resist side down, on a piece of tissue paper for
around 8 minutes. This absorbs the excess. Then, if necessary, put down a
second coat. Have not tried it yet but hope to do so today.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Alex Hun
Sent: Tuesday, April 02, 2013 5:50 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Seno 100 photo resist applicator

Been using the Seno 100 photo resist applicator to sensitize some pcb board
stock. Main problem I find is getting an even coating.� The applicator
sponge is fed from a valve in the main body when you push down. If that
happens you get flooded in resist but just before you are starved, so the
coating tends to be very variable in thickness from board to board and also
on a single board as the stuff tries so quickly it does not level very well.
Only trick I found so far is to keep the resist in the fridge to slow down
the evaporation process as much as possible.

Anybody got any other tips or tricks on how to get a good uniform,
preferable thin, coating using this system?

Thanks

Alex





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