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Originally Posted by 1930deluxe
The radiator and head has been cleaned when I had it apart. Sounds like the Rust 911 would be a better way to go since it dissolves the rust?
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Either will do the job. Less chance of paint damage if you spring a leak with rust911, thermocure or evaporust, also do not have the added baking soda/water treatment.
One of the previous posters had rust flakes. I guess if I was running the rust 911/etc. again, I would install an upper hose filter to be on the safe side, and remove the filter when back flushing. After back flushing reinstall the filter and check occasionally. The Gano filter has a clear version that can be visually checked without removal. There are other filter choices/methods.
White vinegar is cheaper than the others. Walmart has is for 1-2$ a gallon.
For the others check your local big box stores, tractor/farm supply places, auto parts stores. I bought thermocure off amazon, delivery was free since I was purchasing some other things at the same time and met the minimum limit for free shipping.
The choice is yours. Opinions may vary.