Bostik Chem-Calk GPS1 White Polyurethane Sealant, 20 Oz Sausage Case

Description

Chem-Calk GPS1 is a white, one-component polyurethane sealant supplied in 20 oz sausages for general exterior sealing. It is a non-sag sealant for roofing details, flashing, soffit, fascia, termination bar, and dissimilar building material joints.

Chem-Calk GPS1 Benefits

• Polyurethane chemistry cures with atmospheric moisture to form a flexible building seal.
• Non-sag consistency helps crews place clean beads on vertical exterior details.
• Class 25 movement rating supports properly designed construction joints.
• White color fits exterior trim, building envelope, and roofing accessory work.
• Twenty ounce sausage packaging reduces changeovers on longer perimeter or flashing runs.

The product data ties this grade to general sealing installations where dynamic movement matters. It is suitable for painting with latex-based paints after compatibility testing, but it is not recommended for glazing or continuous immersion service.

Chem-Calk GPS1 Applications

• Roof flashing, soffit, fascia, and termination bar sealing.
• Exterior joints between dissimilar building materials.
• General construction sealing where a gun-grade polyurethane bead is needed.
• Metal trim, masonry, wood, stone, concrete, vinyl, and aluminum joint work.
• Maintenance repairs that need white color and flexible movement.

Surface Preparation and Use

Clean the joint before application. Remove dust, oil, wet material, frost, and loose coatings. Use backer rod to control sealant depth where needed. Apply continuous pressure to fill the joint from the bottom, then tool before skin forms so the bead contacts both sides without trapped air.

Technical Details and Documentation

Published data lists ASTM C920 Type S, Grade NS, Class 25, Use NT, plus Federal Specification TT-S-00230C Type II, Class A. For manufacturer background, visit Bostik. Review the data sheet before approving primer use, paint timing, water exposure, or joint design.

Dispensing and Ordering Help

This SKU is the white 20 oz sausage case. Confirm the gun size, nozzle cut, color, and jobsite substrate list before switching from cartridges or a different polyurethane. For related products, browse Chemical Concepts sealants.

For help matching Bostik sealants to exterior building joints, call (800) 220-1966 or email [email protected].