underseal

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underseal

Brit
a coating of a tar or rubber-based material applied to the underside of a motor vehicle to retard corrosion
References in periodicals archive ?
Inc.; precast slabs undersealed with Texas-based Uretek USA's polyurethane foam; and post-tensioned, precast-slab demonstration projects sponsored by FHWA.
I've undersealed a car but soon realised the dirt under his nails was going to be with him forever so it didn't last - the career in mechanics or the boyfriend!