toner transfer method(my mistakes)

[rs1026]

I tried to build a PCB using toner transfer method and committed two blunders.First of all the design used a opamp and while taking the printout I flipped the image horizontaly.After the PCB was ready I observed that no way I could solder the opamp.Since the image was flipped the pin no 1 of opamp and the PCB did not coincide.

Secondly I coated the pcb with clear lacquer to avoid the oxidation of copper but later only at the time of slodering I came to know that lead did not stick properly on coating of lacquer.

Can someone share their experince on toner transfer method?How to avoid these small mistakes and prevent rework

[rs1026]

I think express PCB has taken the drawing to be SMT mounted by defualt. How can I override this in express PCB?

[rs1026]

i should not have flipped the image. If and only if SMT is used then I should have flipped the PCB image.

[dangus]

If they are through-hole components, maybe you can just mount them on the wrong side. Machined-pin style sockets can be soldered at the component side, with care. It helps to include text on the PC board, so you can tell at a glance if it is reversed or not.

I've had mixed success with toner transfer. The paper I use is the biggest variable. However, using an inkjet printer and transparency film (doubled up) and positive photoresist produces much nicer results.