Question 1

Which adhesive should I use for rubber on body panels?

Accepted Answer

Neoprene contact adhesive or a dedicated rubber adhesive is the standard choice for rubber-to-metal or rubber-to-plastic applications. MS polymer also works and remains more flexible after curing, which is useful for parts that flex or vibrate.

Question 2

Can I use superglue for car repairs?

Accepted Answer

Superglue (cyanoacrylate) works well on small surfaces with a tight fit, but it becomes brittle after curing and handles vibration and temperature changes poorly. For small clips or static parts it's fine; for anything requiring strength or flexibility, epoxy or MS polymer is the better choice.

Question 3

How do I remove old sealant before resealing?

Accepted Answer

Soften old sealant with a sealant remover or isopropyl alcohol, cut away the bulk with a plastic scraper or knife, then remove residues with a cloth and solvent. Complete removal is essential: new sealant won't bond reliably over old residue.

Question 4

What's the difference between silicone and MS polymer sealant?

Accepted Answer

Silicone is water-repellent, heat-resistant and long-lasting, but not paintable and difficult to remove cleanly. MS polymer is equally elastic and water-resistant but is paintable, better suited to most body applications and less sensitive to contaminated surfaces.

Question 5

How do I repair a crack in a plastic bumper?

Accepted Answer

From the inside, open up the crack slightly with a grinding tip, bond a piece of fibreglass or repair mat with polyester resin or bumper adhesive, and let it cure. Then skim the outside with filler, sand from coarse to fine and apply primer before painting. Always repair from the inside, it keeps the outer surface tight and gives the repair better strength.

Adhesives, Sealant & Repair

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Adhesives, Sealant & Repair

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Frequently asked questions