When does the chemical reaction between clearcoat and catalyst begin?

When does the chemical reaction between clearcoat and catalyst begin?

• A. they are combined
• B. they are heated
• C. they are sprayed
• D. they are exposed to air

Answer: (A)

In a two-component clearcoat system, the curing reaction starts as soon as the two parts are mixed together. The clearcoat resin and the catalyst/hardener are kept separate until use, and the catalyst activates the resin to begin crosslinking. This chemical cure happens immediately after combining, not simply from heating, spraying, or exposure to air. Heating or spraying are part of the application process, and air exposure helps with solvent evaporation and moisture-driven drying after mixing, but the initial chemical reaction begins at the moment they are mixed. There’s a limited pot life after mixing during which you must apply before the mixture becomes too thick.

In a two-component clearcoat system, the curing reaction starts as soon as the two parts are mixed together. The clearcoat resin and the catalyst/hardener are kept separate until use, and the catalyst activates the resin to begin crosslinking. This chemical cure happens immediately after combining, not simply from heating, spraying, or exposure to air. Heating or spraying are part of the application process, and air exposure helps with solvent evaporation and moisture-driven drying after mixing, but the initial chemical reaction begins at the moment they are mixed. There’s a limited pot life after mixing during which you must apply before the mixture becomes too thick.