Waterproofing basement question

[Brian Dalton]

My wife and I have a multi family we purchased about 8 months ago. About two weeks ago we had a really heavy rain and wound up with water in the basement through various intrusions. The basement is unfinished and used for storage. One issue appears to be weeping concrete blocks in the foundation, the other is water flowing through cracks in the blocks in a crawl space at the front of the house. Had a contractor come in and quote me $6800 for French drains and two sump pumps. Have a few other contractors coming in to take a look as well. 

I don’t want to direct the water away once it’s in, I want to keep it from getting in. In doing some internet research I came across a company called Radon Seal. They appear to have various products for waterproofing various surfaces. Has anyone ever used this product to waterproof a basement and how is it holding up today?