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I use FW1 to cut and polish the surface of my headlights as they are yellowing and getting more opaque as time goes by. It's a fantastic product and I'd like to use it on the rest of my car, but is it OK to use on Duraseal or will it remove the protective coating?

In moderation it should be fine but if in doubt I suggest you try contacting the distributor or manufacturer of the product.

What do the instructions say?

They don't mention any sort of paint protector.