Thanks for the information.
Roland F. Harriston, P.D.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
On 4/2/2013 8:53 AM, Leon Heller wrote:
>
> On 02/04/2013 16:37, Roland Harriston wrote:
> > Pardon my ignorance, but are you using a liquid resist?
> > If so, can you tell me what it is, and where you get it?
>
> It's a liquid supplied in an applicator. Mega Electronics sells it in
> the UK:
>
> http://www.megauk.com/pcb_chemicals.php
>
> Leon
> --
> Leon Heller
> G1HSM
If you check further down the page at Mega.UK you will find 600-031 Seno 1000 Photoresist 1Ltr £91.90...
Read; -
Seno 1000 Photoresist
A professional ready-to-use positive working liquid Photoresist which shows a very strong contrast in developing and has very good adhesion and spreading properties -ideal for the finest circuit board application. The Photoresist can be applied to uncoated PCB laminate by spray, dip and spin coat-ing machines.
The last application quoted "dip and spin-coating machines.
When first started makeing my own PCB's as a spotty Teen, I modified a old Philips 33/45 Record Turn-Table with a small electric motor connected directly to the T/Table shaft.
Mounting the bare, clean Copper clad mounted with sticky-tape to the Table center and turning the motor on.
When motor has run-up to running speed, drop a measured amount of Photoresist onto the center of the spinning board. Centrifical Force will spread an even layer of Resist over the board, any excess will spin of the edge of the board on to the T/Table
Spin times and Measured amount would have to be experimented with to achive desired Resist thickness.
I used this method when Positiv 20 became available in a spray can!
Just spraying onto a board laying on old Newspaper (Horizontal or Vertical) produced poor results; - Horizontal caused "pools" of resist and Vertical caused a ridge of resist flowing to the lower edge. These inital attempts at this "new fangled Hocum" almost drove me told me mental, until one of the RF Boys in Tech revealed his home-made "spin coating Machine"
Thats all folks!...these ramblings may solve the problems at hand or perhaps spark up an idea in someone's thoughts.
chester
[Non-text portions of this message have been removed]