Low pressure crack injection is the only choice for potentially leaky foundation cracks. But with hairline cracks that don't go through the wall, no treatment may be necessary. Certainly not if there is a plastic bubble membrane on the exterior of the foundation from grade to footings.

Worthy,
How can I confirm that I have that membrane on my house? It is a 2 story 20 year old house. The cracks never leaked.
thanks

Dig down about six inches and you'll see a membrane if there is one. Unless yours was a custom house, or is in Ontario, Canada, it's unlikely there's a membrane of any sort.

Any recommendations on products without breaking the bank? Can I go to a big box store and buy one such as Sikaflex Concete fix?

What about just using Loctite� PL� Polyurethane Concrete Crack & Masonry Sealant? The cracks do show some water stain but for the past 2 years I have lived there no water has exited.

I would stick to products specifically designed for interior crack sealant use; the Loctite is for exterior joint sealing.

I have only used independent contractors and I don't know what brands they used.

I purchased do it yourself crack repair kit online from Flexomeric for $99 and my repair looks like the picture that worthy put up. It was a low injection method and it is a permanent repair and not a band-aid. I am glad I found this crack repair kit it was very easy to use and had a step by step instruction sheet inside the kit. I recommend www.flexomeric.com to anyone with a foundation crack in there basement wall.