Description
This white calk is GPS1, a one-component polyurethane sealant for general purpose construction joints that need a flexible, non-sag bead. The 10.1 oz cartridge fits standard applicator guns and is a natural choice for white trim, fascia, soffit returns, siding transitions, and jobsite punch-list sealing where a bright finish color is expected.
Where This Calk Gets Used
GPS1 is used on exterior and interior joints across common building materials, including wood, masonry, concrete, metal, vinyl siding, and vinyl trim board. It is especially useful where a contractor wants one cartridge style for several sealing tasks rather than a specialty product for each surface. The white color pairs well with PVC trim, painted wood, light siding, and window or door details where a darker bead would look out of place.
The product is moisture curing, water-free, and gun grade. That combination makes it practical for vertical joints and overhead details because the bead holds its profile after tooling instead of running down the face of the substrate. It is not a substitute for backer rod or correct joint sizing. Use proper depth control so the sealant can stretch across the joint rather than locking to the back of the cavity.
How This Calk Holds Up
Published GPS1 data describes a durable, flexible polyurethane sealant that can be used indoors or outdoors. On many common construction materials it typically does not require primer to produce a watertight seal, but test adhesion when the surface is weathered, coated, damp, or contaminated by release agents. Tool the bead while it is workable, then allow moisture cure before heavy movement or exposure.
Specifications
| Property | Value |
|---|---|
| SKU | BOS-A52312 |
| Product | GPS1 sealant |
| Color | White |
| Chemistry | One-component polyurethane |
| Consistency | Gun grade, non-sag |
| Package | 10.1 oz cartridge |
| Primary use | General construction sealing |
Order white GPS1 for trim crews, repair carts, and maintenance stock where a clean white bead is the standard finish. Browse related sealants for other construction sealant colors and families. Manufacturer background is available from Bostik.
Need Help?
Need help matching a white sealant to PVC, painted wood, or masonry? Call (800) 220-1966 or email [email protected].
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