Homebrew PCBs

I regularly - or better said - almost exclusively work with dryfilm 
resist. The problem with Positiv 20 you mention is that you will have 
problems with applying an even layer of it let alone the problems with 
dust in the air that will stick to it etc.

Dryfilm resist is haveing a lot of advantages not only for doing PCBs. 
As an example, also make aluminium housings for my projects this way or 
solder stencils. There are both kind of resists available (positive and 
negative) even though the negative ones dominate. You find positive ones 
i.e. marketed as solder stop mask laminate.

I'm also using a regular laminator. You may have to take off the housing 
or modify it in order to adapt it to the thikness of PCB boards. Some 
are better suited than others, but with the sheer amount of products its 
close to impossible to suggest a given product cause it's likely not to 
be available where you live anyways. I simply bought one, tried it out 
and it worked, but that was four years ago. I thus figure that this 
given product is no longer available. If it would not have worked, I 
simply would have put it on ebay and tried another one. The price is no 
real argument nor are the published capabilites cause you will use the 
laminator out of its official specs anyways hence the needed experimenting.

HTH

Markus

dkosokar schrieb:
>
> I'm looking for a positive acting photoresist I can apply at home.
> I've wanted to try Positiv 20 but can't seem to buy it in the USA. Can
> it be had anywhere that you folks know of? Is it a decent resist?
>
> What are you folks using? Yes, I know there are presensitized boards,
> but they are very expensive.
>
> Does anyone use dry film resist? I have a laminator, and wouldn't mind
> using it if this type of resist works well. Does a regular laminator
> work to apply this resist?
>
> I've tried Datak negative acting resist, without much luck, and now my
> bottle is so old, I don't trust it any more. Anyone use this stuff
> successfully? I prefer pos resist because it's easier to print than
> negatives.
>
> How about radical ideas like Diazo compounds used for silk screening?
> Would this stuff have fine enough detail and woul it stand up to
> ferric chloride?
>
> Any input would be greatly appreciated!
>
>