The radiators and plastic cam seals are the weak links of Hondas. Radiator sealer will not work, since the end-tanks are plastic and the core is aluminum itself. In terms of aftermarket OEM replacements, they're even worse than Hondas. So basically if I were you I would get a Honda one, if you have the extra $$$ I'd look into a Koyo, PWR, Fluidyne, or C&R model.