Berkland Polyurethane Seam Sealer 2-Pack (10 oz) White — Paintable, Non-Shrinking Flexible Joint Filler

Berkland Polyurethane Seam Sealer is a flexible, non-shrinking automotive compound in a 2-pack of 10 oz cartridges designed to fill, seal, and be painted over for lasting seam protection.

If you need a reliable seam sealing solution for body panels, floor pans, RV roofs, or welded joints, this two-cartridge kit offers professional-grade polyurethane performance without the common issues of shrinking or cracking. The formula adheres to bare, primed, and painted metal, accepts primer and topcoat quickly, and remains pliable under temperature and vibration stresses. Included nitrile gloves and standard-cartridge sizing make it straightforward to apply with a standard caulking gun for most repair and restoration tasks.

How quickly can I paint over this seam sealer?

The sealer accepts automotive primers and topcoats rapidly—allow a minimum tack time before coating. Typical workflow allows priming or painting the same day for many projects, minimizing downtime.

• Paintable in about 30 minutes under normal conditions.
• Best results: wait 24 hours and scuff prior to final topcoat.
• Compatible with standard automotive primers and finishes.
• Ensure ambient temperature per instructions for optimal cure.

Will this bond to bare metal, primer, or already painted panels?

Yes — the polyurethane formulation is engineered for adhesion to multiple substrates. Proper surface prep improves performance and longevity for both repairs and new assembly.

• Bonds to bare steel after cleaning and scuffing.
• Adheres to primed surfaces with light abrasion beforehand.
• Accepts application over sound painted panels following cleaning.
• Also suitable for fiberglass and composite panels in many repairs.

What kinds of seams and joints can this sealer handle?

This product is made for a wide range of automotive and recreational vehicle sealing tasks. It fills seams, weld joints, and gaps, and resists weathering once cured, making it suitable for interior and exterior use.

• Body panel seams, drip rails, and door jambs.
• Wheel wells, rocker panels, and floor pan repairs.
• Weld-through applications when coatings are stripped around weld flanges.
• RV roof seams and marine joint sealing when waterproofing is needed.

How do I apply and cure the seam sealer for best results?

Preparation and tooling dictate final adhesion and appearance. Follow a few simple steps to set up the surface, then apply with a standard caulking gun and finish to the desired profile.

• Clean surfaces with a VOC-compliant cleaner and scuff with an abrasive pad.
• Pierce cartridge seal, trim nozzle, and apply using a standard caulking gun.
• Tool the bead to shape and remove excess; allow about 45 minutes initial cure.
• For painting, wait up to 24 hours and scuff before priming for best adhesion.

Who is this for? DIY restorers, professional body shops, RV owners, and marine hobbyists who need a dependable, paintable seam compound will find this Berkland 2-pack a practical choice. It suits anyone repairing floor pans, sealing welded flanges, restoring rocker panels, or maintaining RV roofs where a flexible, weather-resistant, and paint-ready seam solution is required. The dual cartridges plus included gloves make it convenient for mid-size jobs or staged work across multiple panels.