Gaco Western GacoPatch Silicone Roof Patch Sealant, Flashing Grade, White (2 Gallon Pail)

GacoPatch is a flashing-grade, stand-alone silicone roof sealant for permanent patching of asphalt, single-ply, metal and most existing coated roofs. This white, flashing-grade formulation is supplied in a pail with a lever-locking lid for one-step application. It needs no primer, reinforcement, or top coat on most substrates.

Key Features:

• No primer needed: Reduces labor time and eliminates the cost of primers, tapes, and top coats over most substrates.
• Permanent repair: Contains no asphalts or acrylics and remains a long-term repair solution.
• UV stable: Does not require a top coat and will not chalk, crack, or peel.
• Damp-surface application: Can be applied to damp surfaces once standing water is removed.
• Flashing grade: Fabric reinforcement is not normally required; horizontal patches even over 1/2 in. thick need no extra steps.
• Permanently flexible: Remains flexible even under ponding water.
• Multiple applications: Use on control joints, coping joints, fishmouths, gutter seams, small membrane holes and surface cracks.

Specifications Table:

Fit and Compatibility:

Adheres to asphalt, single-ply, metal roofs and most existing coatings with no primer on most substrates. For regions requiring VOC content below 50 g/L, Gaco offers GacoFlex GacoPatch Compliant as an alternative. Sacrificial tape may be required for control, coping joints and surface cracks.

Frequently Asked Questions (FAQ):

Q: What is included in the sell unit?
A: One pail of GacoPatch silicone roof patch in White with a lever-locking lid; the manufacturer packages GacoPatch in 2.5 gallon pails.

Q: Do I need primer or reinforcement fabric?
A: No, GacoPatch needs no primer on most substrates, and fabric reinforcement is not normally required for flashing-grade patches.

Q: Can it be applied to a damp roof?
A: Yes, it can be applied to damp surfaces, but standing water should first be removed.

Q: What roof types does it work on?
A: It installs in a single application on asphalt, single-ply, metal, and most existing roof coatings.

Q: Will it hold up in sun and ponding water?
A: It is UV stable, needs no top coat, and remains permanently flexible even under ponding water.

Q: What is the shelf life?
A: GacoPatch carries a 2-year shelf life.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Choose GacoPatch when a roof patch needs to outlast asphalt- or acrylic-based mastics: the silicone chemistry stays flexible and UV stable without a top coat. Clean the repair area and remove standing water before application, and use sacrificial tape on control joints, coping joints and surface cracks as the manufacturer notes. For horizontal patches thicker than 1/2 in., no additional reinforcement or steps are required. If your project has a low-VOC requirement, spec the GacoFlex GacoPatch Compliant version instead.

Work from a stable, dry roof surface, remove standing water before application, and review the product data sheet and safety data sheet before use.

Get a permanent, UV-stable fix with Gaco Western GacoPatch silicone roof patch in White.