Contamination Issue: Back to Basics
The Problem
Last month, a customer contacted us with an issue: their moulds were developing visible build-up and streak marks. Upon investigation during a site visit, we traced the problem back to contamination caused by repeated use of the same application cloths.
The operator believed that as long as the cloth remained wet—kept sealed in a zip-lock bag—it would be fine to reuse. Unfortunately, this is a common misconception.
@marbocote Solvent-based release agents are moisture-curing, meaning that exposure to ambient moisture begins the curing process, even while the cloth is stored. Reusing cloths, even if they appear wet, results in a partially cured product being applied to the mould. This leads to streaking, transfer, and eventual contamination.
Our Solution
Sometimes, the best way forward is to return to the fundamentals.
We introduced our operator training programme, which focuses on essential best practices and reinforces that product freshness and correct application are key to achieving optimum results.
We started by revisiting mould cleaning protocols. Since release agents chemically bond to the mould surface, it’s vital that this surface is completely clean—not just free from visible dust or dirt, but also from unseen contaminants like polishing compounds and wax residues. Clean cloths must be used and changed frequently during this process to ensure a completely clean surface.
Next, we emphasised the importance of applying a Sealer before the Release Agent. The Sealer creates a solid foundation, filling in microporosity and acting as a protective buffer. As always, this must be done using fresh lint-free cloths—never those previously used for applying Release Agent.
Finally, we provided detailed guidance on proper Release Agent application techniques and best practices for re-application.
By following the correct steps from the very beginning, operators can extend mould life, improve release performance, and ultimately increase productivity.
#Marbocote #Releaseagents #Freetraining&refreshercourses #backtobasics
