Dongxw Asphalt Crack Filler and Sealant, Black Waterproof Silicone Gel, 2-Pack

Flexible silicone gel forms a waterproof seal in asphalt and concrete cracks. Its black finish works naturally with dark driveway surfaces. The two-pack format is suited to repair projects that need crack sealing across more than one area.

What to know

Dongxw Asphalt Crack Filler and Sealant is made for horizontal cracks in asphalt, concrete, cement, and masonry surfaces. The flexible formula is designed to bond to these materials while accommodating movement, making it a practical choice when a crack needs a seal rather than a rigid patch-style repair. Its waterproofing helps protect the repaired area from moisture, and the black color blends with many asphalt surfaces.

The gel is applied with a standard caulking gun, without mixing, and is described as self-leveling for a smooth finish. Buyers often praise its effectiveness, appearance, and ease of application. Feedback on crack sealing is mixed, and some buyers describe the consistency as thin, so the result can depend on the crack and how the sealant is applied.

Practical tips

Apply the sealant directly from the caulking gun, there is no mixing step. The self-leveling formula is intended to flow into cracks, and the product description says it can be cleaned up with water. It becomes tack-free in 1–3 hours and reaches a full cure within 24–48 hours, giving you a useful timeframe when planning driveway, sidewalk, patio, or garage-floor repairs.

For a project involving several separate cracks, the two-pack provides sealant for more than one application area. Choose it when you want a flexible, caulk-applied seal on a compatible surface, rather than a repair approach centered on filling and leveling a broader damaged section.

Best use cases

Use this black crack filler for horizontal cracks in asphalt driveways and in concrete, cement, brick, or masonry surfaces. It can also suit repairs on sidewalks, patios, and garage floors, where a waterproof seal helps limit moisture entering through a crack. Its flexible format is especially relevant for sealing a line-shaped opening, while the caulking-gun application supports controlled placement along the repair.

It suits you if the job calls for a waterproof, flexible sealant for cracks in compatible surfaces and you want a product that applies without mixing. Buyers’ comments also highlight easy application and a neat appearance, while feedback on sealing results varies, making the crack repair itself an important part of choosing the right approach.

Before you decide

Which surfaces can it be used on? It is listed for asphalt, cement, concrete, cementitious slabs, brickwork, blockwork, and masonry. Match the sealant to the surface being repaired.

How do you apply it? Use a standard caulking gun to dispense the gel into the crack. The formula is described as self-leveling and does not require mixing.

How long does it take to cure? It is described as tack-free in 1–3 hours, with a full cure in 24–48 hours.

Final verdict

Dongxw’s black silicone crack filler brings together flexible sealing, waterproof protection, and straightforward caulking-gun application in a two-pack format. It is a focused choice for homeowners and DIYers sealing horizontal cracks in asphalt, concrete, and masonry, especially when a dark finish and a flexible repair are useful.