here's the solder paste >>LINK<< I've used for a while... think I've had one tube for about 2 years... keep it in a fridge seems to work well..

also use laser cut mylar pcb stencils to apply the paste, makes it really easy, and quick when you have 100+ pcb's....

As for the pcb design, I didn't post the one I ran above since I wanted to change the design a bit, originally I was thinking of using my
remaining pin, pin 5, to send a delayed pulse out to trigger adjacent modules, didn't really think it through, since if I had a dedicated input pin
it would of worked, but being out of pins I ended up using the same pin I had the phototransistor input on, in doing so, when you chain a row
of modules together when you trigger a module every other one instantly triggers instead of the delayed wave effect I was looking to get..

I only did a run of 1x 155" sq panel from goldenphoenix, so I've used up all my modules, but I plan on doing a bigger batch since I've had people
interested, I'll post some more details once I have my next design ready, it's going to be much much better (I hope) , with some cool effects that
have adjacent modules sending out triggers to each other, making a fluid like effect possible...

that said if anyone wants the files I used to get the above pcb's made send me a PM and I'll gladly send'em over to ya....