SikaFlex 221 Polyurethane Sealant Adhesive Sika Flex Camper Glue Sealing

Sikaflex®-221 is a versatile, high-quality one-component polyurethane adhesive/sealant that cures when exposed to atmospheric moisture. It is suitable for interior sealing and simple bonding applications. It adheres well to a wide range of substrates and is ideal for creating permanently elastic seals with high adhesive strength. Suitable substrates include materials such as metals, metal primers, and coating systems (two-component systems), ceramic and plastic materials.
Consult the manufacturer and perform tests on the original substrates before using Sikaflex®-221 on materials prone to stress cracking.
This product is intended for professional and experienced users only. To ensure adhesion and material compatibility, tests must be conducted with the substrates under real conditions.

Surface preparation:
Surfaces must be clean, dry, and free from grease, oil, and dust.

The surface treatment depends on the specific nature of the substrates and is essential for a lasting bond. Suggestions for surface preparation can be found in the current edition of the appropriate Sika® Pre-treatment Table. It should be noted that these suggestions are based on experience and should still be verified with tests on original substrates.

Application:
Sikaflex®-221 can be worked with between 5 °C and 40 °C, but variations in reactivity and application properties must be taken into account. The optimal temperature for substrates and sealant is between 15 °C and 25 °C.

Sikaflex®-221 can be worked with manual, pneumatic, or electric piston guns, as well as with pumping equipment. For advice on selecting and setting up an appropriate pumping system, contact Sika Industry's System Engineering Department.

Tooling and finishing:
Tooling and finishing must be done within the skin formation time of the sealant. The use of Sika® Tooling Agent N is recommended. Other finishing agents should be tested for suitability and compatibility before use.

Removal:
Unhardened Sikaflex®-221 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once hardened, the material can only be mechanically removed. Hands and exposed skin should be washed immediately using hand cleaning wipes such as Sika® Cleaner-350H, or suitable industrial hand cleaner and water. Do not use solvents on the skin!

Painting over:
Sikaflex®-221 can be optimally painted after skin formation. Painting may be improved by treating the joint surface with Sika® Aktivator-100 or Sika® Aktivator-205 before the painting process. If the paint requires a baking process (> 80 °C), the best performance is achieved by allowing the sealant to fully cure first. All paints should be tested by conducting preliminary tests under the same production conditions. The elasticity of paints is usually lower than that of sealants. This could lead to paint cracking in the joint area.

Disposal:

Jar: FE40 - Iron Collection

Recycle only if perfectly clean and empty.

Otherwise, recycle at designated eco centers.