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Waterproofing a Convertible Roof
Quick answer: Waterproofing is treating a fabric convertible roof so water beads and runs off instead of soaking in. It is reapplied after cleaning, because washing strips the old protection.
What it means
A proper reproof goes on after the hood is clean and dry, restoring the water repellency that keeps the fabric from wetting through and helps it shed dirt. On fabric roofs it is a maintenance step, not a one-off; the protection wears with weather and washing.
Why it matters
It matters because an unprotected fabric roof wets through, stays damp, and is far more prone to mould, green growth and premature failure. Reproofing after every deep clean is cheap insurance for an expensive part.