KEEP ACCURATE RECORDS
Always keep accurate records, and base your future purchases upon the demonstrated comparative results already attained by the various glues you have used in actual practice.
No glue is good to use unless properly prepared. A 16-cent glue may be reduced to the grade of an 8-cent glue by overheating. The grade of the glue at the time it is used is the important thing.
Do not by faulty methods of preparation impair the working quality of your glue. A glue of moderate high-grade properly prepared is better for practical purposes than a high-grade glue whose working quality has been destroyed by excessive or prolonged heating.