Wheat paste made twice a week, and the reason I stopped making it in bulk
· adhesive · a change to bench routine
From about 2021 to early 2025 I made paste once a week, roughly twelve litres, and kept it in a cold room. I stopped. The cost in time went up slightly and the quality of every join went up more.
What bulk paste was doing
Paste that has sat overnight in a cold room is not spoiled. It is different. It has lost some of its free water and its surface has started to skin, and you compensate by working more water back into it on the bench. That adjustment is not consistent from day to day, and it is the kind of inconsistency that shows up later as a joint that is slightly too stiff or slightly too weak.
| Before | One batch a week, ~12 L, wheat flour cooked to a thin jelly, kept 4 – 6 days |
|---|---|
| After | Two batches a week, ~2 L each, used within the same working day |
| Time cost | About 40 minutes more per week, mostly washing |
| Waste | Down from roughly 1.5 L a week thrown out to nothing |
The evidence I actually have
I have 88 six-month checks. Of the 14 failures, 5 involved adhesive applied more than three days after cooking. I do not think that is proof. It is enough for me to have changed the routine and enough for me to write the reason down rather than just say "fresh is better".
What I have not changed
- The recipe. Same flour, same cook time, same thin jelly.
- No additives. No glycerin, no clove oil, no pre-made powders.
- Paste for large areas is still thinned with water on the brush, not in the pot.
A boring entry about a boring material. It is the entry people write to me about, which I find funny.