U-Seal 500 | Multi-Purpose One-Component Polyurethane Adhesive & Sealant

U-Seal 500 is a one-component, elastic polyurethane adhesive and sealant, designed for use with caulking guns, non-sagging. The product cures under the influence of atmospheric moisture, forming a high-performance compound with permanent elasticity and excellent aging resistance, as well as weather and environmental impact resistance.

• Simultaneous bonding and sealing of joints

• Permanent elasticity; can withstand joint movement of ±25%

• Easy to apply with a caulking gun and high stability

• Excellent thixotropy, non-sagging

• Good shock and impact resistance

• Vibration reduction and soundproofing capabilities

• Excellent adhesion without the need for a primer on most common construction and industrial materials

• Elastic bonding between metals, plastics, glass, and other materials

• Non-staining; neutral, does not harm the substrate surface

• Resistant to aging, weathering, cleaning agents, seawater, and limewater

• Can be painted with a variety of water-based and solvent-based paints (pre-testing recommended)

Application

U-Seal 501 is suitable for sealing joints such as welds and overlaps in all areas of the vehicle body, including metal paintwork, restoration of original brush marks, simple bonding, and vibration reduction and soundproofing in vehicle body repair and construction. Suitable surfaces include metal, metal primer, and paint layers (2-component systems), and painted plastics.

Certification

TECHNICAL DATA

Instructions for Use

Surfaces to be bonded must be thoroughly cleaned, dry, and free from dust or grease. U-Seal 500 offers excellent adhesion without the need for a primer on most common construction materials. Therefore, using a primer is not necessary if the bonding surface is properly prepared and strengthened.

However, materials such as tiles, natural stone, plastics, coatings, and other surface treatments may present challenges to adhesion. Due to the unpredictable nature of these surfaces, it is recommended to conduct preliminary tests. Precast concrete panels using mold release agents other than polyethylene films should be sandblasted or mechanically ground, and dust-free.

Recommended application temperature: 15°-25°C. To make it easier to use or when working in cold weather, we recommend storing the material at around 25°C before use. To ensure the sealant can move freely in the joint, it is essential that the sealant does not stick to the bottom of the joint. Therefore, a polyethylene backer rod (joint filler) should be placed at the correct depth to create the proper joint.

If necessary, apply the appropriate primer to both sides of the joint and wait for sufficient drying time to prevent solvent retention, which could cause bubbles in uncured sealant as the temperature increases. For optimal performance, the sealant should be applied when the joint is at the midpoint of its designed expansion and contraction range. Press the sealant firmly into the joint, ensuring it fully contacts both sides of the joint and the backer rod at the bottom. Keep the nozzle in the sealant and continue with a steady flow of sealant, following the nozzle tip to avoid trapping air. Avoid overlapping the sealant to eliminate the risk of trapping air.

Shaping and finishing should be done while the sealant is still tacky. U-Seal 500 can be painted over. Preliminary testing is recommended to check compatibility by conducting initial trials. Caution should be taken when using alcohol-based paints or alkyd resins, as they may hinder the curing process of the sealant and extend the drying time of the paint layer. The hardness and thickness of the paint layer can affect the sealant’s elasticity and cause the paint to crack. Do not allow the sealant to cure in the presence of curing silicone sealants. Avoid contact with cleaning solvents during curing. When applying the sealant, avoid trapping air. As the system cures through moisture, ensure adequate exposure to air.

Cleaning Instructions

Clean used tools with acetone or solvent. When the sealant is uncured, it can be wiped off with paper or cloth. Once the sealant has cured, removal can only be done mechanically. Avoid direct skin contact by wearing latex, rubber, or polyethylene gloves. If the sealant contacts skin, remove immediately and wash with soap and water.

Storage Instructions

U-Seal 500 can be stored for 12 months in its original (unopened) packaging at temperatures between 10°C and 25°C in a dry, cool place. The storage temperature should not exceed 25°C for extended periods. Keep away from damp areas, direct sunlight, and heat sources.