1. How to avoid bubbles?

(1) It is recommended to use products with low viscosity and long operation time, so that the air can be discharged before the material is cured
(2), keep the curing temperature below 45℃, to avoid the temperature too high and cause the pores can not be discharged

2. How to determine the ratio?

The amount of curing agent and the change of ambient temperature and humidity have great influence on curing speed. The increase of curing agent will accelerate the curing reaction. Therefore, the method of increasing and decreasing the amount of curing agent can usually be used to adjust the curing speed, and the recommended amount is 10:0.8-10:1.2 (mass ratio). If the proportion needs to be changed, it should be applied after simple experiment.

3. How to remove silica gel?

Before curing, use a sharp knife (or a clean cotton wipe) to scrape off the uncured gel, and then clean the residue with a solvent such as isopropyl alcohol. After curing, you can first use a knife to scrape off as much silica gel as possible, and then use solvents (120# solvent oil, alcohol, xylene and acetone, etc.) to remove various residues, soak and decompose it.

4. What is a restore and why?

Tin fatty acid is one of the most commonly used catalysts for this reaction. In the presence of water, it will hydrolyze into alcohol and catalyze the rapid occurrence of this reaction. However, there is a reaction balance in this process.