Did your resin remain flexible after the curing time? There can be several reasons for this phenomenon. Let’s take a look at them.
Incorrect ratio of components A and B
An incorrect ratio of components A and B is the most common culprit for a flexible resin product. It is very important to measure the epoxy resin according to the exact ratio specified on its packaging. Remember, the ratio is by weight; measuring in milliliters in mixing containers is not acceptable. Also, make sure your scale is well-calibrated and has fresh batteries. A scale that has dropped or has old batteries is likely not to weigh as accurately as needed for the resin.
Poor mixing
It may happen that if you mix the resin improperly, the entire cast or part of it remains rubbery. The resin must be mixed thoroughly for several minutes. The material needs to be scraped from the sides and bottom of the container and mixed again intensively in both directions. After mixing, it is recommended to pour the resin into another clean container and mix it again. Only double mixing will achieve perfectly mixed resin.
Embedding un-dried flowers
The water present in live flowers can negatively affect the curing process. Not only can the resin bubble up, but it can also remain flexible due to the presence of water. This applies to all water-containing materials.
Using acrylic or oil-based paints
These paints are not suitable for use with resin. Due to the water (acrylic) and separating agents (oil-based) contained in them, the resin may not cure properly, or in the worst case, it could cause an exothermic reaction.
Incorrect temperature of the material and surroundings
The resin requires the correct temperature for both the components and the environment in which it cures. This temperature is specified for each resin. If the temperature is not maintained, the result can be a flexible or improperly cured product.
Using too much dye
For each dye, the maximum amount you can use in the resin is specified. If you exceed this amount, the resin may not cure properly, and the product may remain flexible or even liquid.
Using resins not intended for thin pouring
Some resins may remain flexible if poured in a thin layer. If you are pouring in a thin layer, please make sure that such pouring is possible with the chosen resin. Always check in the product description to ensure that the selected resin is suitable for your intended product.
If you have ended up with a flexible product, unfortunately, it cannot be fixed. However, if you follow the above advice in the future, you are sure to achieve a perfect cast next time!