13/08/2026
When neutral putty starts showing sanding peeling problems in summer, many manufacturers first suspect insufficient adhesion.
But in some cases, the real issue is quite different:
The putty surface becomes too strong, too quickly.
Higher temperatures can accelerate strength development. Combined with coarse heavy calcium carbonate or excessive gel materials such as pre-gelatinized starch and PVA, the surface may become difficult for sanding machines to cut properly.
This can create the familiar βtwo-layerβ peeling-like effect during sanding.
For formula optimization, manufacturers should pay attention to:
β’ Heavy calcium carbonate fineness and particle distribution
β’ Gel material dosage
β’ Seasonal temperature and humidity
β’ Actual application and sanding conditions
There is no one-size-fits-all dosage. The right solution should be determined through laboratory testing + local application verification.
In this episode, MARY explains how to control putty strength and improve sanding performance during hot weather.
The goal is not simply higher strength β it is the right balance between strength and workability.
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