Using Toner on Gel Coats: What You Need to Know
Gel coats, commonly used in various industries such as automotive, marine, and aerospace, require specific care and preparation when applying finishes like toner. The type of gel coat, its age, and surface condition play significant roles in the effectiveness of toner application and the overall outcome.
Understanding Gel Coats
Gel coats are a type of resin that is used as the outer protective layer for various materials. They serve as a barrier against UV damage, chemical corrosion, and physical wear. Freshly molded gel coats are relatively smooth and can be easily treated. However, as they age, the surface properties change, making toner application a more complex task.
Surface Preparation for Fresh Gel Coats
When working with a freshly molded gel coat, the process is straightforward. You can directly apply toner to the surface and wipe it off with acetone. Acetone is a common solvent that effectively removes excess toner without causing damage to the gel coat.
The Challenges of Aging Gel Coats
As a gel coat ages, it loses its smooth, sealed surface. Instead, it resembles a microscopic bubble generator. During the molding process, some air and gases get trapped beneath the surface, leading to a cratered texture that's challenging to clean.
The process involves the gel coat taking air with it when sprayed onto the mold, which can create tiny bubbles and craters. This phenomenon is more pronounced when there is over-catalysis or excessive promotion, such as with D.M.A.A. Once these tiny bubbles are eroded or sanded off, the surface left behind is highly porous, making it almost impossible to remove toner or other finishes effectively.
Advanced Gel Coat Preparation Techniques
Not all gel coats behave the same way. Some advanced techniques, such as degassing vinyl ester gel coat, can result in a smoother, more uniform surface. This process involves placing the gel coat in a vacuum chamber and applying a low catalyst percentage, typically around 0.6, with no extra promoters.
Using a brush, the gel coat is brushed on and then allowed to sit at a controlled temperature, around 18-20°C, for a few hours. Subsequent coats are brushed on after a few hours and laminated, creating a surface that can withstand vacuum and hold the mold together effectively.
Conclusion: Gel Coats and Toner Application
When working with gel coats and toner, it's crucial to consider the type of gel coat, its age, and the surface condition. Freshly molded gel coats are easier to work with, while aged gel coats require more advanced preparation techniques. By understanding these factors and employing the right techniques, you can achieve the best possible results in your project.
Additional Resources
To learn more about the proper application of toner and other finishes on gel coats, refer to the articles and guides available on our website, or contact our customer support team for personalized assistance.