I found this tip in the forums somewhere and though I would give it a go as its impossible to find boots for my 87 KDX.
Bought a can for $30 from autobarn and had some great results.
The cracks that were once showing are now completely covered and the stuff is pretty strong and flexible once set.
I gave it 4 coats and had plenty left over.
The only thing I would had done differently is cover the holes for the screws before spraying.
One of bolts got snagged going in, but it did show off how flexible and strong the stuff is :)
![Image](https://lh3.googleusercontent.com/-e4qmEXEGjiw/UroiaC0i_AI/AAAAAAAAJ6A/1hI1cketKrk/w626-h834-no/20131225_110939.jpg)
![Image](https://lh3.googleusercontent.com/-XLbbo1eOEBs/Uroi5YrRi3I/AAAAAAAAJ6w/UDAv5iUp9Vs/w626-h834-no/20131225_111011.jpg)