Where the rule names the hobby
On this page11
Most spines in this library do not mention the craft they are nearest
They name a substance, a product class, a hazard or a quantity, and the connection to a hobby has to be read in. This part names one outright.
The fifth exemption is written for model making
Catalyzed coatings marketed solely for use on radio-controlled model powered aircraft. A federal lead paint exemption drafted around a hobby product.
Marketed solely is a condition about selling, not about chemistry
The same coating sold for a second purpose loses the exemption. Which puts the test on how a product is positioned rather than on what is in it, and that is unusual in a ban framed on composition.
Catalyzed narrows it further
A two part coating that cures by chemical reaction rather than by solvent evaporation. So the exemption is for a specific class of finish used on a specific class of model.
And the other four exemptions in the same paragraph are industrial
Agricultural and industrial equipment refinish coatings. Industrial and commercial building and equipment maintenance coatings, including traffic and safety marking. Graphic art coatings. Touchup coatings for agricultural, lawn and garden equipment and appliances.
Which makes the model aircraft entry the odd one on the list
Four categories of professional and industrial use, and one hobby. It sits there because the coating in question has a performance requirement that was hard to meet otherwise at the time the exemption was written.
Graphic art coatings are defined by where they are applied
Products marketed solely for application on billboards, road signs and similar uses and for identification marking in industrial buildings. Again a marketing condition rather than a composition one.
Every one of the five costs a warning label
The paragraph (b) exemptions apply only if the product complies with paragraph (a), which prescribes a signal word and two statements. The exemption is from the ban, not from labeling.
And a second, smaller list is exempt with no labeling at all
Mirrors which are part of furniture articles to the extent they bear lead-containing backing paint. Artists’ paints and related materials. And metal furniture articles, but not metal children’s furniture, bearing factory-applied coatings.
Two tiers of exemption, and the difference is what the reader is told
One tier says you may sell this if you warn. The other says you may sell this and say nothing. Across this library that two tier structure is rare and it is worth recognizing when it appears.