3M Ultrapro Autobody Sealant — Clear 5 oz Tube, High‑Solids Fast‑Curing Flexible Seam Sealer

3M Ultrapro Autobody Sealant 08302 is a clear, high-solids, heavy-bodied seam sealer designed to cure quickly and stay flexible for professional autobody sealing tasks.

This 5 oz tube of 3M Ultrapro delivers a solvent-based, quick-skinning formula made for metal and primed surfaces where fast handling and low shrinkage matter. Engineered for autobody work, the sealant provides strong adhesion, sustained elasticity, and a rapid cure profile so technicians can move efficiently through multiple operations without long wait times. It is intended for industrial and occupational use.

How fast does this sealant dry and how long can I work with it?

The Ultrapro formula is optimized for speed: it skins quickly and cures quickly to reduce downtime on the job. Typical working time falls in the 5–10 minute range, letting you shape or tool beads before the sealant sets.

• Work time: approximately 5–10 minutes
• Quick-skinning for early handling
• Rapid-drying to allow follow-up steps sooner

Will this product stay flexible over time and resist shrinking?

This sealant contains a high-solids adhesive that minimizes shrinkage as it cures and keeps elasticity through temperature changes and vibrations. That flexibility helps maintain sealed seams on doors, panels, and floor areas without cracking or splitting.

• High-solids formulation reduces volume loss
• Designed to remain elastic with vehicle movement
• Suitable for seams that experience flex and vibration

What surfaces and repair areas is it best suited for?

3M Ultrapro adheres well to properly prepared metal and primed substrates commonly found in autobody repair. It’s intended for seams and joints where a resilient, paintable seam sealer is required, such as door skins and rocker panels.

• Door skins, rocker panels, rear body panels
• Trunk seams, floor pans and similar seams
• Use on properly prepared and primed surfaces only

Do I need special tools or precautions to apply it?

The 5 oz tube is a convenient size and designed for ease of application; many technicians apply it without a cartridge gun for spot or small seam work. Because it is solvent-based and intended for occupational use, follow normal ventilation, PPE, and surface-prep guidelines.

• Tube size allows manual application for small jobs
• Use appropriate respirators and gloves for solvent-based products
• Ensure surfaces are clean, dry, and primed where required

Who is this for: 3M Ultrapro Autobody Sealant 08302 is tailored to professional autobody technicians, collision repair shops, and industrial maintenance crews who need a fast-curing, low-shrinkage seam sealer for metal panels and structural seams. It’s best when used by trained personnel in controlled, occupational environments where ventilation and protective gear are available.