J-B Weld ClearWeld Pro Size Clear Epoxy 2×4 oz — 5-Min Set, Transparent Finish

J-B Weld ClearWeld Pro Size is a two-part, clear-setting epoxy that bonds many materials in a five-minute set and cures to a strong, transparent finish.

This professional-size kit contains two 4 oz tubes of the same ClearWeld formula known for fast handling and a nearly invisible finish when applied thin. Mixed 1:1, the epoxy sets in about five minutes and reaches handling cure around one hour, producing a durable bond with 3,900 PSI tensile strength. It’s formulated to work on metal, glass, ceramics, tile, wood, concrete, and many plastics, offering an all-purpose option for repairs, crafts, and light structural fixes.

How quickly will this epoxy set and when is it fully cured?

ClearWeld sets rapidly to allow fast progress on a repair: expect a five-minute set time after mixing equal parts. You can usually handle or lightly stress the joint in about one hour, but full cure strength develops beyond that timeframe depending on layer thickness and temperature.

• Mix ratio: 1:1 by volume for resin and hardener.
• Set time: approximately 5 minutes for initial set.
• Handling time: roughly 1 hour; avoid major loads until fully cured.
• Best clarity: thin layers under 15 mil cure clear and transparent.

Which materials will ClearWeld adhere to reliably?

This epoxy works on a broad range of substrates, making it a versatile choice for household fixes and hobby projects. It creates high-strength bonds on rigid surfaces and fills small gaps when applied correctly and prepared surfaces are clean and dry.

• Compatible with metal, glass, ceramic and tile for repairs and reattaching parts.
• Adheres to many plastics and composites—test first on flexible plastics.
• Effective on wood and concrete for small structural or cosmetic fixes.
• Not intended for continuous immersion or high-flex applications without testing.

What strength and appearance can I expect after curing?

ClearWeld reaches a tensile strength of about 3,900 PSI, providing a strong mechanical bond suitable for many repair scenarios. When applied in thin layers (less than ~15 mil), the cured epoxy dries transparent, minimizing the visual impact of the repair.

• Tensile strength: approximately 3,900 PSI for cured adhesive.
• Appearance: transparent finish on thin applications.
• Thickness tips: thicker beads may appear less clear and take longer to reach full strength.
• Finish options: sand and polish after full cure for a smooth look.

How should I apply and prepare surfaces for the best bond?

Preparation determines the success of the bond: clean, dry and, when possible, lightly roughen surfaces to increase adhesion. Mix equal parts thoroughly and apply within the working window; clamp or support parts during initial set for consistent contact.

• Clean surfaces of grease, oil, dust and loose particles before bonding.
• For smooth or glossy substrates, scuff with sandpaper to promote adhesion.
• Mix a 1:1 ratio until color is uniform and apply quickly—five-minute set requires swift work.
• Clamp or hold parts in place until the epoxy reaches handling strength.

Who is this for? J-B Weld ClearWeld Pro Size is ideal for contractors, makers, and homeowners who need a fast-setting, clear epoxy in larger quantities. It suits anyone repairing glass, ceramics, metal or wood, as well as hobbyists who value a near-invisible finish. Avoid relying on it for high-flex joints, continuous underwater use or structural load-bearing beyond its rated strengths without additional mechanical support.