lots of products with various claims.
for instance, 'sanitred' will tell you the same about their products
BBB says unsatisfactory record due to unanswered complaints.
I`m not saying they suck & i`m not saying their great,but,imo anyone/any company etc that states/advertises to the Public that 'it is impossible to waterproof a basement from the outside' either/and....gives less than 2 craps about you/the public or at best has little knowledge of basement waterproofing,self interest/mind games.
Many make other bs claims such as 'outside excavation is unnecessary,it was done when your home was built & it didnt work then and won`t work now' and quite a few others.
http://www.askthebuilder.com/NH058_-_Waterproofing_Foundations.shtml 2nd and 5th parag`s... 'there is a Significant Difference between Damproofing and Waterproofing'...and lets Not forget backfilling with peastone/gravel,Very important. 'to permanently Stop water & water vapor from entering your foundation walls,you need to Waterproof them. Damproofing is an inexpensive way to meet the lowest minimum standard of the building code.'
Most, not all, but many more than not get water/seepage in their basement due to outside cracks `n other openings below and above ground.These same cracks/openings that allow water to enter and very possibly cause mold `n efflorescence,also allow pathways for radon gas and termites to enter.
With block walls,sometimes there will be NO visible Crack on the inside of basement,thats right...the wall(s) may look fine and one won`t see any cracks. BUT,just because a crack(s) is Not visible from the inside of basement does NOT mean there isnt a hairline--1+ inch wide crack(s) on the outside,block walls often crack this way.
This is where `n how Water gets INTO the hollow block wall, into the cells of the block and will often show up inside the basement where...the bottom of wall & floor meet, the cold joint.