Drying (slow or not at all)
The paint takes a long time, (longer than expected) to become hard.
- Activator/hardener has been left out of two pack systems.
- Too little or too much activator/hardener used.
- No driers added to synthetics, (only for HMG mixing schemes).
- Heavy application.
- Drying environment is insufficient, (too humid, too cold, little or no air movement).
- Insufficient flash off between coats.
- Absorption of driers in Old synthetic products used after their shelf life.
- Contaminated substrate, oil, grease, diesel/petrol, silicones.
- Make sure activator is used in two pack systems.
- Always add the correct amount of hardener and make sure that the lid is replaced immediately with isocyanate hardeners after use.
- Only apply at recommended film thicknesses.
- Make sure the drying environment is suitable for the product being used. In some product HMG supply “wintermix hardeners” that are specially designed for colder conditions.
- Make sure, (especially with synthetics) that there is good movement and circulation of air.
- Make sure flash off time is adhered to between coats.
- Do not use products after their recommended shelf life.
- Make sure surfaces are clean and degreased before application.
Make sure the object being painted/surface is in a warm, ventilated area.