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Yes, that can be theoretically tested using an appropriate solvent (Prepsol, and the like).
Usually the anchored film is stable enough to withstand subsequent applications with its own carrier solvent - when the sealant is tough enough. Sealant formulas can be temporary/durable by design. A temporary film is highly unstable (few weeks), while a durable-film formula remains on the surface for months or after numerous detergent washes. A cleverly chosen solvent can have an impact
on the overall formulation performance. The purpose of the solvent in a product is to carry the active ingredients; to ‘wet’ the surface so that a uniform film is produced; and to clean the surface by dissolving light road film, dirt, grime or other light contamination. When they are weak (not true chemical cleaners), they can not disturb the previously crosslinked, fully cured layer. So, solvents are not just solubilizing the active ingredients; they are doing far more than that.
(For me, they are artistically distorting the ketchup bottle of my #21... :-D)
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