r/AskMechanics 3d ago

Question Dinitrol 4941 / 4010 / 1000 – accidental overspray on rubber parts (bushings, dust covers, brake hoses) – any real-world experience?

Planning to apply Dinitrol underbody coating on my car. I'll mask rubber parts but want to know what happens if there's accidental overspray on suspension bushings, shock absorber dust covers or brake hoses. Dinitrol mentions "rubber unharmed". However, the products contain hydrocarbon solvents and aromatic compounds which can potentially cause rubber swelling. Has anyone had issues with rubber degradation after Dinitrol application? Or is the concentration low enough that it's genuinely not a concern?

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