Bonstone Fast Set 39 Gray Cold Weather Epoxy

Description

Bonstone Fast Set 39 is a gray, two-part epoxy for structural bonding and repair when cold conditions or a short initial set are part of the job. It bonds natural stone, concrete, masonry, metal, and wood, including slightly damp or porous stone. The 1:1 system is offered in quart, gallon, and pail kits so restoration crews can match package size to the repair area and expected material use.

Where Bonstone Fast Set 39 Is Used

Use it for reattaching stone, anchoring bolts, dowels, rebar, and pins, and repairing cracks in masonry or concrete assemblies. The gray color blends more naturally with many structural repair areas than a bright or translucent adhesive. Its cold-weather positioning is useful during exterior restoration and construction schedules that cannot wait for warm shop conditions. The product information identifies a 30-minute set time at 75 F and the ability to cure below freezing.

Surface condition still controls bond quality. Remove loose particles, laitance, coatings, dust, oil, and standing water. Dry-fit the parts and prepare clamps, shims, or temporary supports before mixing. Slightly damp stone is within the stated application range, but saturated joints, frost, and contaminated surfaces can prevent reliable contact.

How Bonstone Fast Set 39 Handles

Measure equal amounts of components A and B, then mix until the color and texture are uniform with no streaks. Apply enough material to wet both bonding surfaces without trapping large voids. Bring parts together within the available working window and hold the assembly in position until it can resist movement. Temperature, batch size, and substrate mass affect how quickly mixed epoxy develops body, so prepare smaller batches when placement is detailed.

Do not use package availability as permission to mix the full container. Choose a batch size that can be placed cleanly, and use separate tools when dispensing from bulk packaging to avoid contaminating either component. For anchors, confirm hole geometry, embedment, edge distance, and design load through the project specification. The adhesive does not replace engineering review for critical structural connections.

Fast Set 39 Specifications

Plan cleanup before mixing. Keep resin and hardener containers closed when they are not being dispensed, protect adjacent stone from smears, and remove uncured residue with the method approved for the substrate and jobsite. Wear the protective equipment specified by the current safety documentation. For visible stone, test the complete preparation and cure process on a representative area so color, edge staining, and surface cleanup can be evaluated before the main repair.

Select the kit based on repair volume, crew pace, and the amount that can be mixed and placed within one batch. The live variant family includes quart, gallon, and pail formats. Browse related epoxy adhesives and repair compounds for alternate colors, cure profiles, and application formats. Visit the manufacturer website for company background.

Need Help?

Need help selecting a kit size or planning a cold-weather stone repair? Call (800) 220-1966 or email [email protected].