“Stop leak” tends to be a bad word in the automotive industry. Why? For three reasons:
There are inferior products out there that drag down the entire category as a whole, and
There are instances in which the product was installed improperly, or into problematic conditions (dirty or partially-clogged cooling systems, in particular)
The mechanical damage to the car is so bad that no chemical tool can fix it. In these cases, a customer tries a stop leak product, it doesn’t work, and proclaims it useless and ineffective.
Taking these point by point:
Our products have been, and continue to be, used in OEM applications. Brand new cars get our stuff installed at time of manufacture. Think about…