At GT, our windscreen repair resins have been independently tested by a leading UK university laboratory. A common question in the industry is whether windscreen repair resin contains acid?—a topic often surrounded by uncertainty.

To illustrate this, the image compares substances ranked by acidity. While water is neutral, milk and GT REPAIRX resin follow closely; though not technically neutral like water, they are among the least acidic substances shown. For context, these are followed by coffee, tomatoes, cola, vinegar, lemon, and finally, battery acid on the right of the picture.

This comparison does not mean caution is unnecessary. All brands of windscreen repair resin are industrial adhesives. A risk assessment should always be conducted, adopting a hierarchy of control measures to ensure working safely, so far as is reasonably practicable. GT supports this by providing UV-resistant, leak-free bottles with non-smudging safety labels—details that matter.

Best Practice & Safety

Personal protective equipment (PPE) is just one part of working safely and sometimes thought as the only control measure.

Best practice includes:

• Using resin in well-ventilated areas, commonly outdoors by default.
• Wearing nitrile gloves and safety glasses.
• Storing bottles in supplied sealed zip-lock bags.
• Washing skin immediately with soap and water upon contact.
• Other PPE determined by RA.

It is a misconception that a lack of smell equals safety. In fact, odourless vapours could be more hazardous because they offer no warning of exposure—similar to carbon monoxide. An adhesives chemical vapour still exists even if there is no smell.

People can react differently to every day items and foods and no one person will be the same. It could be like a nut, milk or egg allergy or even a hair dye reaction, which is why hairdressers carry out skin patch tests days before colouring someone's hair.