You can undercoat a vehicle at home on the cheap.
Back in Northwestern PA, we used an air compressor, siphon gun, and used motor oil. Put one end of a hose on the siphon and drop the other end in a jug of used oil and spray the underside.
We did this every fall.
https://www.amazon.com/WYNNsky-Sipho...d-tools&sr=1-2
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