Ken, I found several sealers that excluded plastic, but a kid at NAPA pointed me to a two part epoxy that is specifically designed for plastics called VersaChem Plastic Welder. I mixed up a couple of batches, covered the two areas and let it dry for the prescribed 24 hour full cure time. Put the tank back in this afternoon and so far it is fine, no drips and only $6 instead of $75for a new tank.