Why Pros Choose HP4
High-performance Hybrid Polymer sealant built for siding, trim, windows, and today’s modern exterior materials.
HP4 blends the weather durability of silicone with the adhesion strength of polyurethane, delivering exceptional movement capability, broad substrate bonding, and long-term flexibility. It installs easily across a wide temperature range, cures quickly, and is fully paintable.
Every cartridge includes a factory-engineered V-notch nozzle that delivers a professional-quality bead improving joint fill and adhesion while reducing installer-to-installer variability.
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Key Benefits
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Hybrid Polymer formulation for superior adhesion & weather resistance
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Paintable with most coatings
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Bonds to nearly all building materials—porous and non-porous
- PVC-safe, vinyl-safe, metal-safe
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Fast skin and fast cure for jobsite efficiency
- Excellent UV and weather resistance
- Applies to damp surfaces; rain-ready shortly after skin formation
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±50% movement capability for dynamic exterior joints
- Non-shrinking, non-cracking, non-yellowing
- Solvent-free, isocyanate-free, low odor
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V-Notch Nozzle Advantages (Included with HP4)
The included V-notch nozzle produces a deep-penetrating bead that drives sealant into the joint cavity — improving joint fill, adhesion, and weatherproof performance, while reducing installer-to-installer variability.
- Reduces or eliminates the need for tooling in most applications
- Enhances joint fill and substrate contact
- Reduces over-application and material waste
- Produces straighter, more professional finish lines
- Improves consistency across crew.
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Where to Use It
Primary Exterior Applications
- Siding, trim, fascia & soffits
- Fiber-cement (Hardie®), engineered wood (LP®), vinyl, metal siding
- Window & door perimeters
- Expansion & control joints
- Brick-to-trim transitions
- Masonry, stucco, concrete
- Roofing details & flashing connections
- Exterior penetrations (vents, pipes, fixtures)
Interior Applications
- High-movement, durable, paintable transitions
- Trim, casing, baseboards
Directional Recommendations
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Color Availability
White, Black, Brown, Gray, Clear
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Packaging
10.1 fl oz cartridge
Includes V-notch nozzle
