Non-shrinking caulk for trim Built in 1960, some of the walls are concrete. As such, sometimes the baseboards are not able to be secured close enough to the wall and there sometimes is up to a 3/16" gap. Apr 29, 2016 · Just like with paint -- probably even more so than paint -- there is an enormous difference in quality and life-span of caulkings. In fact, I typically purchase the most expensive caulking on the shelf for both interior and exterior painting projects because they flex more, shrink less, and resist cracking better than the others. SpecSeal® Series LC Sealant dries without shrinking to form a flexible shield against the propagation of fire. Its premium latex binder system is totally resistant to water and will not re-emulsify after drying. SpecSeal® Series LC Sealant is non-halogenated, contains no asbestos, inorganic fibers or solvents.