Rubbers

When we refer to 'rubbers', we mean the rubber-like seals which seal the roof where it meets the windows and top of the windscreen.

Unlike normal cars, most convertible cars do not have door pillars and frames around the window, meaning that when the doors are closed, the glassware interfaces directly with rubbers attached to the hood.  It is essential for a waterproof seal for these rubbers to remain clean, free from debris and supple, so they don't deform, crack or become weak. Rubbers can be revived with a conditioner, otherwise they may need to be replaced if they are severely perished.

These rubbers may also have scoops and channels to drain water away and form part of the roof's drainage system.

What it means

Rubbers is the everyday term detailers and leak specialists use for the rubber seals and trims around a car. These include door aperture seals, window frame rubbers, boot and tailgate seals, bonnet rubbers and the various seals that run around a convertible roof. They are usually hollow or foam-filled sections of rubber that compress when doors, glass and roofs close, forming a cushion and a barrier against water and wind.

Why it matters

Seals do the last few millimetres of keeping a car dry. Paint and membranes handle everything up to the gap; once rubbers shrink or harden, that gap stops closing and rain tracks into doors, pillars, boots and the cabin regardless of how sound everything upstream of it is. Wind noise arrives at the same time, because a seal that no longer meets its face whistles and buffets at speed and makes the car feel a decade older than it is.

Condition shows from ten feet away too. Green, crusty rubbers around glass and soft tops read as neglect faster than tired paint does, and the same damp that greens a roof greens the seals beside it. Hardened rubbers cause mechanical trouble as well: when a door or tailgate has to be slammed to latch, the hinges and catches take the load that the seal should have been absorbing.

Where rubbers get flagged

Inspection reports, leak diagnoses and detailing notes all name them, in comments such as clean roof and rubbers, rubbers green with algae, door rubbers perished or rubbers shrunken causing gap at top of door. Soft-top work pairs them with the roof almost automatically: clean roof and rubbers, or roof green, rubbers also green.

Context

Rubbers sit at the boundary between the moving parts of the car and the fixed body shell. They work together with glass alignment, hinges, latches, membranes and drainage channels to manage water and wind. Over time, UV, ozone, temperature changes and simple compression set can harden and flatten rubbers, while dirt, algae and lichen build up on the surface. Regular cleaning and occasional dressing can help keep them supple and presentable, but badly perished, cracked or shrunken rubbers often need replacement to restore proper sealing. When diagnosing leaks, it is important to look at the condition and contact of the rubbers as well as the more obvious roof and panel areas. Green rubbers are almost always accompanied by a green roof; our workshop cleans the two together and dresses the rubbers at the end, which also helps seat them slightly better and reduces the chances of a weep around the window line.

Common mistakes

• Blaming all leaks on the roof fabric or glass and overlooking shrunken or flattened rubbers that are no longer making proper contact.
• Scrubbing rubbers with very strong cleaners or solvents, which can dry them out and accelerate cracking and shrinkage.
• Using thick, greasy dressings that look shiny but actually attract dust and grime, making green growth and streaking worse.
• Ignoring obviously green, mouldy rubbers around a soft top, which is a sign the roof, gutters and drains may also be neglected and prone to leaks.

Authored by Danny Argent. Reviewed by Gary Wray. Last updated 16 May 2026.