Product Simson Prep K is a pretreatment to improve the adhesion of several specific Simson products, based on Silyl Modified Polymer (SMP) and silicones, mainly on plastic substrates. Applications v Pretreatment of plastics like hard and soft PVC (no PP, PE and PTFE). v Pretreatment of ABS. Method of use Substrate: substrate needs to be dry, clean, and free of grease and dust. Keep container closed until using it. Method of use: Keep container closed until moment of application. Open the container and puncture the foil. Do not use Prep K from the container, but pour as much as one can work with in 30 minutes in a separate can. Do not use remains of product after 30 minutes. Close container as soon as possible. Prep K can be applied with a clean brush or with a cloth. Prep K is transparent, but can be discoulour due to UV light, making it visible. If this is unwanted, it is necessary to use a masking tape. Do not pretreat a larger surface area than can be bonded within 6 hours. Do not touch treated surfaces, as this can affect adhesion negatively. Condensation may also affect adhesion negatively. Application temperature: +5°C to +30°C. Drying time: approx. 30 minutes. Strongly contaminated surfaces need to be cleaned first with for example Simson Cleaner 14. Test if cleaner is affecting surface condition. Note: Prep K may attack the surface of some plastics. Please do a compatibility test before usage.