Which sealant to use for the mechanical seal? – Honda CX500, GL500, CX650, GL650

Here’s a list of sealers which people have found to work well with the mechanical seal:

• Permatex 22071 Water Pump and Thermostat RTV Silicone Gasket – eBay, Amazon

Note that depending on which brand of mechanical seal you buy it may already have sealant pre-applied.