So I posted two weeks back about this coolant leak I have been chasing, replaced a few hoses, waiting on the throttle body gasket to replace, then tonight found the leak after there were more than just a few drops under the truck when I parked. I took off the plastic around the radiator, cleaned all of the coolat, started it up, and Right on top of the radiator reservoir/tank (don't know if that is the right name, the thin black plastic tank that the hoses run into the top corner of on the right hand side of the truck's radiator) , right in the middle of the flat plastic top, is a hairline crack 2 mm long so small you cannot even see it until the slow puddle of coolant starts seaping out. All novice advice and prelim research online (left my RAVE CD Rom at work) says that I have to replace the entire radiator and cannot just get a side tank, but it is such a small little crack, I was wondering if I could not just test roughing up the plastic with a low grit sandpaper and using a plastic epoxy or some other sealer?

2nd part: If wisdom is that I must dig into my RoverRack / Snow Tire Fund for a boring radiator, is the $399 British atlantic model my best bet?

Thank you in advance for the advice, you guys always deliver...