Discerning among various lead paint removal products is more complicated that many people realize.
According to HUD: "Abatement is removal of either the building component or the paint itself or the near-permanent enclosure of lead-based paint hazards. ... Abatement treatments provide a higher margin of safety than interim controls since the effectiveness of the work is less dependent on resident action, maintenance of housing stock, the conscientiousness of property manager, and the attention of maintenance workers during repair. ...
...In contrast to interim controls, lead-based paint abatement refers to a group of measures that can be expected to eliminate or reduce exposures to lead hazards for at least 20 years under normal circumstances."
What's Considered a "Long Term Solution" To Lead Paint Hazards?
The reason HUD uses 20 years as a general rule is because the life expectancy of most (replaceable) building materials is about 20 years. While removal is a permanent solution, the act of removing the components - such as walls or wood - will create considerable new hazards. While it's possible to handle smaller lead paint hazards on a DIY basis, most health and housing experts recommend hiring contractors who have experience or specialize in lead paint removal projects.
In some cases, enclosing certain structures makes sense, but like removal, enclosing simply won't work in all cases.