I've posted before of my attempts to halt corrosion of the thermostat bore.
The recent thread prompted me to have another look (I haven't checked since last July)
Here is a current photo with 1954 hours on the engine
![](https://s9.postimg.org/jtt9pgezj/IMG_5416.jpg)
![](http://www.yamahaoutboardparts.com/core/image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==)
Although I have inspected it periodically, I have done no "work" to the surface since the initial "treatment" :
January 2015 - at 1100 running hours
![](https://s9.postimg.org/tecwcb1qn/thermo_primer.jpg)
![](http://www.yamahaoutboardparts.com/core/image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==)
initially I found this condition in November 2014:
![](https://s9.postimg.org/96zgk3jpr/IMG_0724.jpg)
![](http://www.yamahaoutboardparts.com/core/image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==)
The recent thread prompted me to have another look (I haven't checked since last July)
Here is a current photo with 1954 hours on the engine
![](https://s9.postimg.org/jtt9pgezj/IMG_5416.jpg)
Although I have inspected it periodically, I have done no "work" to the surface since the initial "treatment" :
January 2015 - at 1100 running hours
![](https://s9.postimg.org/tecwcb1qn/thermo_primer.jpg)
initially I found this condition in November 2014:
![](https://s9.postimg.org/96zgk3jpr/IMG_0724.jpg)