What Type of Metal Sealant to Use for Various Metals

There are many types of metal sealants on the market, many of which are designed to be used with specific metal types. Here are the most commonly used sealants for metals and the metal types to which they should be applied.


The most widely used, and most versatile sealant to use for metals is silicone. Silicone has many uses for sealing many types of metal structures and substrates. It is used on metal roofs, window installation, marine structures and plumbing applications. The various metals it can be applied to are iron, copper, aluminum, steel, stainless steel and galvanized steel.


Polyurethane is a very common type of metal sealant. It comes in both a semi-solid form for sealing joints and in a liquid form for sealing large surfaces of metal.


Tripolymer is an elastomeric sealant used for various surfaces and architectural metals. It is not recommended for high-traffic areas, glazing surfaces or in areas where food is prepared.


Primer is also considered as a sealant for metal. It is a zinc-based sealant and protector. It can be applied to any type of metal to prevent rusting, oxidation and corrosion. It can be sprayed or brushed prior to painting.

There are many types of metal sealants available. The ones listed here are most widely used for any type of metal and are quite easy to apply.