Multi-Tech Products sheds light on a common yet perplexing issue faced by professionals in the industry: fisheyes in repaired surfaces. These imperfections can mar both MMA (Methyl Methacrylate) and Quick Glaze repairs, affecting the quality and appearance of the finish. The culprit often lies within the air lines: oil and moisture.

1) The Challenge with Oil and Moisture

Compressed air systems, integral to the spraying process, can harbor high levels of oil and moisture. These contaminants originate from the compressor, where moisture forms through condensation due to changes in pressure and temperature, a phenomenon exacerbated in humid environments. Over time, this moisture can lead to rust and oxidation within the system, further polluting the air lines. When contaminated air is used in spraying, it can alter the color of the repair material and lead to fisheyes, a term used to describe small, crater-like imperfections on the surface.

2) Limitations of Water Traps

Water traps, despite being a common solution, often fall short in effectively removing these liquids. Even the most robust water traps cannot guarantee the removal of all moisture and oil from the air lines, leaving room for contamination to reach the repair surface.

3) The Solution: Desiccant Filter Towers

For industrial applications, Rob Clos recommends the use of an industrial-grade desiccant filter tower. This system ensures that all foreign liquids are removed, providing a clean, dry air supply for spraying. The desiccant in the tower absorbs moisture until it becomes saturated, at which point the color indicator changes, signaling the need for replacement or regeneration. An integrated dust filter further purifies the air, delivering it to the outlet port ready for use, dried to a -40°F dew point.

4) Portable Desiccant Air Filters

For repair professionals and situations where moisture presence is minimal, an in-line desiccant air filter offers a portable and effective solution. Multi-Tech Products offers these units, which are ideal for stopping moisture and oil from contaminating the repair surface, thus preventing fisheyes.

5) Best Practices for Moisture Management

Ensuring the air supply is free from moisture and oil requires diligence:

• Frequent Draining: Regularly drain the compressor to prevent water accumulation.
• Clear the Lines: Before starting a repair, run the compressor and open the air lines to clear out any residual moisture.
• Use a Desiccant Filter: Installing a desiccant filter, either at the source or inline, will significantly reduce the risk of fisheyes by providing a dry, clean air supply for the spraying process.

Conclusion

Understanding the impact of oil and moisture on the quality of bathtub surface repairs is crucial for professionals aiming to deliver flawless results. By adopting robust moisture control measures, such as the use of desiccant filter towers and in-line filters, technicians can enhance their repair quality, ensuring satisfied customers and enduring finishes.