If there’s recommendation to use white spirits there’s probably a reason. Over the counter IPA generally is no better than 91% alcohol, mixed with water, and often lower. Water interacts with surfaces that silicone might want to interact with. Silicone sprays are not aqueous, and usually silicone and water don’t mix. You want silicone there because it repels water. Impeding the interaction of the silicone with the metal surface will change its performance.

Is this overthinking things? Maybe. But if you want performance of the end product, the best bet is to copy the approach that is recommended. While neat alcohols might be used as solvents with silicone, the use of a “wet” alcohol may result in different performance.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
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Past Diesels:
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