Quote from another forum:
"Per an email from Dicor, the 502 is the same as the 501 but is intended for machine dispensing. Manufacturers use it I guess.
They said I could use either one for my satellite dish.
The email reply:
"The 501LSW was developed to be used at the consumer level. The 502LSW was developed to be used in a pumping system at the manufacturing level. Very little difference with the exception of case quantity.
Any or all of Dicor’s lap sealants will work for your application depending on whether you need a self leveling or non-leveling lap sealant.
Kathy/Dicor"