I have my truck sprayed every year by a guy who uses Pro Fleet Care. Similar to Krown. Great stuff. Better than any other undercoating. Is sprayed into all cracks and crevasses. Drips for days. Underside is done with a heavy version of the oil so it sticks all winter.
I follow a guy on YouTube who uses bar and chain oil for a chain saw. Cuts it with some kerosene and sprays the underneath every few years. Kerosene drys out and leaves a dry surface after a drive on a dusty road.
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Mike
2017 Ram 1500 Crew Cab 4x4 / 5.7 Hemi / 3.92 axles
2020 Bullet 291RLS
1-wife / 1-dog / 2-kids
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