SEM 39387 2K Self Leveling Seam Sealer GRAY 7 oz Cartridge Automotive

SEM 39387 Dual-Mix Self Leveling Seam Sealer - 7 oz Cartridge - Gray - Automotive Epoxy for Roof, Trunk & Drip Rail Seams

Brand New, Factory Sealed! Perfect for automotive restoration, bodywork, and DIY projects. This high-quality two-component epoxy from SEM Products is designed to seal drip rails, roof seams, and trunk seams with ease. It provides a professional, flexible finish that won't shrink, harden, or crack over time. Ideal for both professionals and home enthusiasts looking to achieve OEM-like results.

Key Features:

• OEM Recommended: Trusted by manufacturers for reliable performance.
• Direct to Metal Application: Can be applied on bare metal (with proper prep) or primed surfaces.
• Paintable in 15 Minutes: Quick drying for faster project completion.
• Excellent Self-Leveling Properties: Flows smoothly into crevices for a seamless, even seal.
• Permanently Flexible: Maintains elasticity to handle vehicle movement without cracking.
• Dual-Mix Forever Warranty: Backed by SEM's lifetime warranty when used as directed.
• Versatile Substrates: Works on bare metal, OEM finishes, epoxy primers, and urethane primers.
• No Shrinkage or Hardening: Ensures long-lasting durability.

Typical Properties:

• Color: Gray
• Container: 7 oz Dual-Mix Cartridge
• Working Time: 10 minutes at 70°F (21°C)
• Set Time: 15 minutes at 70°F (21°C)
• Top Coat/Paint Time: 15 minutes at 70°F (21°C)
• Full Cure Time: 1 hour at 70°F (21°C)

This sealer is VOC compliant in most areas (check your local regulations). It's easy to apply with a standard caulking gun or SEM's recommended applicators (like the Universal Manual Applicator - SEM 71119, sold separately). Static mixers (SEM 70011 or 70012) are required for proper mixing and are available separately.

Easy-to-Follow Instructions:

Follow these simple steps for professional results. Always wear gloves, eye protection, and work in a well-ventilated area. Test in a small area first if unsure.

Tools You'll Need:

• SEM 39387 Seam Sealer Cartridge
• Applicator gun (e.g., SEM 71119 Manual Applicator)
• Static mixer tip (e.g., SEM 70011)
• Cleaner (e.g., SEM Solve or XXX Universal Surface Cleaner)
• Sandpaper (P80 for bare metal, P400 for primed surfaces) or gray scuff pad
• Masking tape, razor knife, tack cloth, and optional heat gun
• Solvent for cleanup (VOC-compliant in your area)

Step 1: Preparation (10-15 minutes)

• Warm the vehicle or work area to at least 70°F (21°C) for one hour and ensure it's level.
• Clean the seams/joints thoroughly with SEM Solve or XXX Universal Surface Cleaner to remove dirt, grease, and old sealant.
• For primed surfaces: Sand with P400 grit paper or scuff with a gray pad.
• For bare metal: Sand with P80 grit paper.
• Blow off dust and wipe with a tack cloth.
• Re-clean the area with your chosen cleaner and let dry completely.
• Important Note: If the area flexes (like roof skins or drip rails), apply a two-component urethane or epoxy primer first (e.g., World Class DTM Primer), let it cure fully, then sand before sealing. Avoid acid-based self-etching primers to prevent cracking.

Step 2: Mixing (5 minutes)

• Insert the cartridge into your applicator gun.
• Pry off the cap with a flathead screwdriver.
• Squeeze out a small amount until both components flow equally (to equalize).
• Attach the static mixer tip and cut the end to your desired bead size (start small for control).
• Hold the gun upright and dispense until product flows into the mixer.
• Test dispense a small bead on scrap material to confirm even mixing (it should be uniform gray).

Step 3: Application (10-15 minutes)

• Apply masking tape at the forward end of the seam/channel to create a dam and prevent runoff.
• Dispense the sealer down the center of the entire seam length. It will flow out and self-level automatically.
• If air bubbles appear, use a heat gun on low heat (2-6 inches away) with a sweeping motion to pop them while the product is wet.
• Wipe away any excess with a small amount of VOC-compliant solvent.
• Carefully remove the tape with a razor knife while wet. Trim or sand the end if needed to match the original contour, but avoid lifting the sealer from the base.
• Let it set for 15 minutes at 70°F before painting or top-coating.

Step 4: Cleanup and Curing

• Clean tools immediately with solvent.
• Allow 1 hour for full cure at 70°F. Colder temps may extend times.
• Store unused cartridge in a cool, dry place (shelf life: 2 years). Snap the cap back on matching shapes.

Tips for Success:

• Work quickly within the 10-minute window.
• If reusing the cartridge, replace the mixer tip each time.
• For best results, apply in moderate humidity and avoid direct sunlight during application.
• Always review the Safety Data Sheet (SDS) for health precautions.

This SEM 39387 is a must-have for restoring classic cars, fixing leaks, or prepping for paint. Ships fast – buy with confidence! If you have questions, feel free to ask.