What can effectively patch cracks in concrete block foundation walls from the inside?

In the context of patching cracks in concrete block foundation walls from the inside, it's important to consider the properties of the materials available. The correct answer indicates that none of the options provided are effective for this purpose.

When dealing with cracks in concrete, particularly in foundation walls, the material used for patching needs to bond well with the concrete, fill the cracks effectively, and ideally allow for some movement without cracking further. Traditional options such as asphalt-based products, while they might offer some level of moisture resistance, do not adhere well enough to concrete surfaces to be considered a long-term solution.

Epoxy can be an effective repair material for concrete due to its strong bonding properties and durability; however, it may not adequately address the movement in foundation walls or the underlying issues that caused the cracks to develop. Additionally, epoxy can be difficult to work with effectively in large applications.

Mastic products are generally not suitable for repairing structural concrete as they lack the strength and durability needed for this type of application. They are often used for sealing but do not provide the structural support that a foundation repair necessitates.

Thus, the response indicating that none of the available options would effectively patch the cracks highlights the need for specialized repair materials, often specifically designed for concrete repairs,