Paste lumps are generally present in the adhesive prior to being applied to the wallcovering. They are commonly formed during the mixing process.
To eliminate the problem it is advisable to add the powdered adhesive very slowly into the water while at the same time continuously stirring.
How to avoid paste lumps when wallpapering
Extra care must be taken during the mixing process to avoid whipping the adhesive too fast, because this may cause aeration of the adhesive. This is a condition that occurs when the adhesive is filled with tiny miniature bubbles which can resemble a suds mixture.
Note: Any form of contamination in an adhesive can show behind the wallcoverings, therefore it is advisable to strain all adhesives prior to using.
Wallpaper problem solver
Thank you to Aspiring Walls for providing the information for this quick reference guide.
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