Motor mounts cost like $75 ur talking $15 for a product that 'might' protect them and an a few hours of extra labor a year to meticulously wash and reapply the coating. Not to mention you will probably need a need.bottle of whatever product you decide to use because it may get lost in the garage or used up elsewhere.

This doesn't seem like it's worth it. Your saving maybe a few years of life on a part that's gonna last 10-15 years. Who knows if your even gonna have the same fire and excitement for the car then, let alone even still own it

It will be the same cost and labor time in the long run to just spray them with water every engine bay cleaning and getting new ones when they go bad

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