Have you checked the exposure with a stouffer scale? When I changed the bulbs in my Polimero A4 to Sylvania black light bulbs the exposure was all over the place. It took quite a while for them to 'burn in' and stabilize. In fact it still varies with ambient temp. and how warmed up the machine is.
Let us know how your new brushes work out. I may need new brushes in mine, sooner or later.
--- In PPLetterpress@yahoogroups.com, "Ian" <ductormanpaperboy@...> wrote:
> Hello everyone
> I have been using the same plate maker for a while now and think it is time for new brushes. I am starting to get fatter lines and reverses are not washing out. I am concerned that there may also be an exposure issue.
> I know that the brushes are finished but I am wondering if this would also cause the fatter lines? I did try reducing exposure times but am finding no difference.
> The raw photopolymer is from Boxcar and are KF95 plates exposed at 3 minutes with a washout between 4-5 minutes.
> I replaced the bulbs about 4 months ago. I was unable to get the same bulbs as the machine is from Europe
> (Polimero A-5) so I put in black lights with the same wattage. These have been working fine but I am wondering if it is possible they may be also starting to cause problems.
> Sorry for the short book