Most helpful positive review
48 of 48 people found the following review helpful
Great Product with poor instructions
on May 14, 2012
This product will work, but you need more direction than the instructions on the package or their website. I think most of the poor reviews come from people who followed the vague instructions on the package causing the product to fail.
The important property of this product is that it cures in 2 stages.
Stage 1, water dries from the putty.
Stage 2, the putty cures/hardens from high heat.
During stage 1 it is critical that the temperature is below 212. If the temperature rises above boiling, the product will swell and fall off the pipe. The package states to start the engine and let it idle. That will work to speed stage 1 but if it gets over 212, it will look like the exhaust is blowing the putty off of the pipe. If you notice it rising like cookies in the oven, shut the car off, take a tool and push the putty back in place.
Stage 1 is the complex stage. How long it takes will depend on the amount/depth of putty you use. If you can use starting the car to speed stage 1 will depend how hot the engine gets the exhaust pipe at the repair. If you are in front of the muffler, I would not use the engine. My best guess is wait 2 days. You could use a blow dryer or a trouble light to provide a safe heat. The putty will become hard during stage 1, but I don't know of an indicator that you have finished stage 1. The real test comes when applying the curing heat of stage 2. If it doesn't swell, you finished stage 1. If it does swell, just reshape it and wait longer to apply heat over 212. The putty will stick to itself, so if it swells and you want to add more of it to the repair, it will stick/join the existing putty.
Stage 2 is simple, if you have completely finished stage 1. All you need to do is drive and the heat from the exhaust will cure the putty to a tough waterproof seal. (If it swells and falls out, you didn't finish stage 1)
My only concern would be if the putty is not heated enough from driving, it would not cure. I do not have any input on this as my repair was close to the engine and over 1000 degrees while driving.
My repair has lasted 30 days and it seems very solid. I hope that you can experiment with this product and find a method that works. My repair was to a very solid header pipe that only had a hole due to a heat shield that was spot welded on and rusted out at the spot welds. The product is cheap and easy to work with, about the consistency of toothpaste. Until you pass stage 2, the putty is still water soluble. If you need to soften it, just add water.
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