... -yellowing CharacteristicsHX-1300 is one-component, acetic-curing silicone sealant for general purpose sealing in do-it-yourself application..HX-1300 cures ... with a primer.Restrictions on useHX-1300 is not recommended for use on substrates, such as marble, concrete, fibrous cement and ... or zinc due to corrosion.HX-1300 is not recommended for use on natural stone, such as marble, granite, quartzite, as ...