Next time, maybe print them single side and take them to Kinkos or someplace like that. They may have a waterproof paper.
Yep. That's what I'd have probably done.
found the resulting product totally useless ( a topo map)once bitten twice shy
They probably used a color laser printer and for some reason some of those do a really crappy job on topo maps. I know because I had some printed at a "Quick Print" type place and they really did suck.
But they do great with plain text and the laser print is a lot more water resistant too, so for this job that would have been a good choice.