smartmaniacs.co.uk/forum/the-cars/roadster/16763-solve-leaks-the-silicon-grease-way

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Forum thread: Solve leaks the silicon grease way -

smartmaniacs.co.uk/forum/the-cars/roadster/16763-solve-leaks-the-silicon-grease-way · p. 1 · Applies to: 451

smartManiacs Source: smartmaniacs.co.uk Topic: window and roof seal leaks Models discussed: 451 Solution status: yes

Problem: Smart Roadster experiences water leaks from rubber seals around windows and roof lining due to worn or poorly sealed rubber-to-surface interfaces.

Solution: Apply silicone grease (not petroleum-based) along rubber seals every three months to prevent water seepage. Use silicone grease from a tube (e.g., RS Components part 494-124) and apply sparingly with a cloth to avoid excess buildup. Dab onto seals rather than spraying directly from can. Wipe excess with cloth to ensure even coating and prevent water pooling. This prevents water from crossing the crack between rubber seal and glass/roof lining.

Key facts: - Must use silicone-based grease, not petroleum/vaseline-based products which degrade rubber - Reapply every three months for continued effectiveness - Solution does not address mirror or speaker installation leaks (warranty work) - Silicone may transfer to clothing/seats and affect window water beading; regular window cleaning resolves this - Multiple users confirmed effectiveness on their own vehicles with various makes/models - Applying sparingly and wiping excess prevents excess water pooling and reduces squeaking - Water beads and flows better off roof seals with proper application