Description
Sika Sikasil Auto is a neutral-cure, one-component silicone adhesive sealant made for vehicle repair and trim work, supplied here in a handy 75g tube. It forms a permanent, flexible bond or seal on a wide range of automotive materials, and the cured rubber copes with sunlight, salt spray, temperature swings, vibration and regular car-wash products without hardening, shrinking or cracking.
About the formula
A moisture-curing, one-component silicone with a neutral cure, so it does not give off the acidic smell of acetic silicones and is described by the manufacturer as non-corrosive. It cures by reacting with moisture in the air, starting at the surface and working into the core of the joint. Cure speed depends on humidity and temperature, and it cures more slowly in cold conditions. Once cured it is a soft, stretchy rubber with strong thermal, UV, weathering and vibration resistance, and it stays serviceable from -50°C up to 250°C.
Where to use it
Indoors: bonding small interior components and trim, sealing joints, and cutting down noise and vibration inside the vehicle.
Outdoors: sealing and bonding small exterior parts and joints on cars and other vehicles where weather, UV and salt spray are a concern.
Suitable materials include fibreglass, metals, most plastics, glass and painted surfaces. Always test on the actual substrates and under your real conditions first to confirm adhesion and material compatibility.
How to use it
Apply at ambient temperatures between 5°C and 45°C onto clean, dry surfaces that are free of oil, grease and dust. Run the sealant into the joint or onto the part and assemble or tool it before it skins over. At 23°C and 50% relative humidity it skins in about 10 minutes and is tack free in about 20 minutes. Excess uncured sealant can be wiped off with Sika Remover-208 or a similar product. Cured sealant has to be trimmed or scraped away mechanically. If you get it on your skin, wash straight away with SikaCleaner-350H or a suitable industrial hand cleaner and water. Do not use solvents on skin.
Important notes
Sikasil Auto cannot be overpainted, so complete any painting before sealing or mask the area. It cures to a depth of about 3 mm in 24 hours, so deeper joints and thicker beads take longer. Check the manufacturer's data sheet for any surfaces or applications where the product is not recommended. This product is designed for vehicle applications. Test first on a small area before committing to the full job.
Specifications
| Brand |
Sika |
| Product |
Sikasil Auto Multipurpose Automotive Adhesive Sealant |
| Pack |
75g tube |
| Colour |
Translucent |
| Chemical base |
1-component silicone, neutral cure, moisture-curing |
| Application |
Tube, applied by hand |
| Application temperature |
5 to 45°C ambient |
| Skin time |
About 10 minutes (23°C, 50% r.h.) |
| Tack free time |
About 20 minutes (23°C, 50% r.h.) |
| Cure speed |
About 24 hours to a 3 mm depth |
| Density (uncured) |
1.0 kg/L |
| Shore A hardness |
30 |
| Tensile strength |
1.0 N/mm² |
| Elongation at break |
600% |
| Service temperature |
-50 to 250°C |
| Shelf life |
18 months when stored below 25°C |
| Use |
Vehicle interior and exterior |
Safety
Follow normal good practice for silicone sealants: work in a well-ventilated area, wear gloves and eye protection, and keep out of reach of children. Wash skin promptly after contact using an industrial hand cleaner and water, and do not use solvents on skin. Store in the original sealed tube below 25°C. Refer to the Safety Data Sheet (SDS) for full details.
