There are basically two types of internal air bubbles in epoxy systems. The first are bubbles caused by the air entering the system during mixing. The other is the bubbles caused by the gas formed during the reaction of the resin and hardener. Apart from internal reasons, the physical conditions and chemical effects of other components in which the epoxy is used may also cause external air bubbles.
Observe the following points in order to prevent or minimize the formation of air bubbles and bubbles.
- Do not make the mixture at too high speed.
- Follow the maximum thickness of use rule that belongs to the type of epoxy resin you use. Do not exceed the specified application thickness.
- Using a vacuum machine greatly eliminates the possibility of internal air bubbles.
- Excessive heating of the resin that needs to dry at room temperature or drying in extremely hot environments such as an oven may cause air bubble drying due to the sudden reaction. (Except for oven drying epoxy resins produced for this purpose.)
- Do not use coating type resins in casting type works.
- Do not use casting type resins whose consistency has increased due to the cold environment without normalizing their consistency. Check out our article titled “My Resin Densified”.
- Bubbles may occur from the object to be placed in the epoxy system. Make a casting considering the possibility of air formation of the spaces on the object. For example, while epoxy penetrates the air gaps in the wood, bubbles can come out. If necessary, cast in two stages.
- Bubbles form on absorbent surfaces due to the impregnation effect of epoxy. Wood, concrete, etc. Do not cast or cover absorbent surfaces without priming.
- Foaming and blistering may occur due to the reaction due to moist surfaces and / or water mixing with the epoxy. Do not apply directly to damp surfaces or objects. (Except for moisture tolerant epoxy systems produced for this purpose.)
- Do not use water based paints as colorants.
- Product, environment and equipment selection is extremely important for a clean and glassy casting.