Homebrew PCBs

On 14/04/2011 19:11, Tom Biery wrote:
> I have recently used some positive resist boards from eBay and am expereinceing
> exposure times of up to twice as long as the times it is taking for the positive
> resist boards bought from Circuit Specialists.
>
>
> Is this because they are old or defective?
>
> I have a UV exposure box and the eBay boards take 150 seconds and the new
> Circuit Specialists boards only take 80 seconds?

I've found that resist-coated boards I've bought sometimes aren't much 
use when they are more than six months old.

Leon
-- 
Leon Heller
G1HSM