Stabilizing Microtubules and Microfilaments

In an actin assembly and a microtubule polymerization, when an ATP/GTP cap is formed, what is meant by "stabilizing" the microtubule or microfilament? Does it stop polymerization and prevent the microtubule or microfilament from continuing to grow or does it just prevent it from falling apart as easily as if the cap was not there? Does polymerization pause if a large ATP/GTP cap forms so that hydrolysis can "catch up"?

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...ap (in the case of microtubules) or an ATP cap (in the case of ...