MIKE TUNA wrote:
I am probably wrong but I believe years ago there where things mixed in the bottom paints that were said could affect your signal. I believe those paints were also toxic to the environment are not used anymore.
Most bottom paints (even today) contain copper. There is actually legislation being proposed in California right now to ban the use of copper in bottom paint. I'm not an electrical engineer, but it does make total sense that painting the bottom of a transducer with a paint that contains copper would indeed mess up the signal quite a bit.
Prior to the late 1980's all bottom paint was TIN-BASED. That stuff worked so much better than this copper stuff we have now except it was too toxic so Congress banned it.

I know for a fact that painting a transducer with that tin stuff really messed things up too!
(This post edited by DoctorFish on 01/06/2006)