I wanted to get rid of inner rust and protect the tank, so I used the set by the german producer Ammon Technik - including the cleaner, rust remover and anti rust paint with hardener. Speaking of the 2k anti rust paint, this is probably the best paint I've ever worked with (in terms if you screw up - and that's what happened - it dries fast, allows perfect covering and really good smoothening on the other day). Not mentioning the adhesive power which is just superb. I am not paid for promoting this paint, but when something is good, then it is good). The briefing video for this product on youtube features a distinguished guy, pouring the Horex tank with gloves. Well, working with this set, you will get your hands dirty for sure. While the video makes a 'piece of cake' impression, my experiece with corrosive reminds something between alchemy workshop and Chernobyl (also due to leakage that needed to be stopped with some extra loctite resin layer). Even the guy who sold me the set was assuring me that "it can even be done in your bathroom"...Oookay. But, everything comes with practice, and now I feel much more confident that I could have done it even better :) anyway, please be my guests to see the highlights.
Sealing the fuel cock hole with an aluminum sheet. Its position
caused a lot of trouble while draining the tank later
Mixing the cleaner with water, releasing an acrid stench
The immersion heater should keep the temperature at around 60 - 65 °C
for one hour duration. The value often varied due to distribution of heat.
Drying the tank with an air gun after using a deruster
which left the tank degreased after a proper flushing with water
Red anti-rust 2K rubber paint with hardener before mixing and pouring in
The cork cap from honey jar doing its job good
The biggest issue comes from the fact, that srx doesn't have the fuel cock assy located at the lowest part of the tank - as most of (oldtimer) bikes do. If you run out of gas, you still have about 0.5 liter of petrol left at each side of the tank because of the fuel valve location (which is utterly silly, Mr. Yamaha!).That means that even draining the tank is very problematic and for that reason the paint left a thick layer, even after rotating the tank endlessly. However, on the next day, I was able to sand the excessive "dripstones" with a sand paper.
The paint leftover can be used as an excellent primer. Some portion I was able to drain before was levigated on the bottom of the tank with a brush.
