You should avoid spraying standard WD-40 on rubber plumbing seals, toilet flappers, wax rings, braking systems, bicycle chains requiring specialized wax, electronic touchscreen displays, or food preparation surfaces. Because WD-40 is a petroleum-based solvent and light lubricant, it deteriorates rubber and synthetic polymers, causing them to swell, warp, or disintegrate. It also strips away specialized factory greases from precision bearings where a heavier grease is required. Verification: Check manufacturer guidelines on mechanical equipment before applying any lubricating sprays.
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