Wurth Brushable Seam Sealer seals cracks, crevices and body seams. It also waterproofs and insulates. Wurth Brushable Seam Sealer is flexible; will not crack, shrink, harden or sag and it is paintable in 45 minutes. It is a 100% rubberized seam and joint sealer for bare and painted metals. Excellent adhesion and is ideal for all seams and joints. Permanently flexible. Will not crack and also holds a perfect mark to match the OEM seams. Non sag formula seals seams and joints that are spot welded, riveted or bolted. Seals overlap joints and seams with an OEM appearance.