Re: LOG condition after cleaning
That pitting looks pretty bad but can't really tell if the integrity of the metal is bad by the photo. Pictures often make the corrosion look deeper than reality because the colors change and shadows. I jhave taken hundres of pictures of metal corrosion in the last 20+ years.
If this were mild steel, I would say it looks like under-deposit corrosion. But I am not aware of aluminum corroding in this manner. Its hard to just look at the result or the pitting and determine the mechanism....need more facts.
But, I can say this....
Those of us will aluminum pontoons should not leave biological material and deposits on their toons. Doing so lowers your performance, but also can create very severe conditions under the deposits. Water w/o oxygen in combination with bacteria creates a very corroisive environment.
Also, that oxidized brown/black line that no one likes.....we guess what? THATS aluminum oxide and is how aluminum protects itself from corrosion. If you guys acid wash that off, the aluminum will just corrode again. Its a healthy thing for the metal to leave it there.