Flammable. Most paints and paint-related solvents are regulated as flammable liquids and are forbidden in carry-on or checked baggage.
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Firearms and ammunition, as well as any replicas or imitations. Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals. Lithium batteries and other hazardous materials, as these can pose a safety risk if not handled properly.
Most paints and paint-related solvents are regulated as flammable liquids and are forbidden in carry-on or checked baggage. Many (but not all) artist paints are nonflammable and, if posing no other hazard, may be carried in carry-on and checked baggage.
For example, TSA guidance is very clear: If prohibited items are found during security checks, they won't be returned to their owners. That may vary in other countries, but the general rule is that confiscations are permanent.
Checked Baggage ScreeningThe majority of checked baggage is screened without the need for a physical bag search. Inspection Notices: TSA may inspect your checked baggage during the screening process.
TSA screens approximately 1.4 million checked bags for explosives and other dangerous items daily. Upon check in, your checked baggage will be provided to TSA for security screening.
Wear clothing and shoes without metal, and be ready to remove your belt if it has a metal buckle. Tuck large metal jewelry pieces into your carry-on bag before you go through the security checkpoint. Put change and keys into your carry-on or empty your pockets into a plastic bin when you arrive at the checkpoint.
Toothpaste is considered a liquid by the TSA (Transport Security Agency), even though it's technically a paste. In fact, all pastes, gels, waxes, and lotions are also classified as liquids. And even today, these substances are still restricted by the 3-1-1 rule in hand luggage due to safety threats.