Spray coating is one of the most widely used industrial coating methods, but it is not always the best solution.
For components with complex geometry, recessed areas or difficult-to-reach surfaces, epoxy dipping can provide an alternative approach.
How Epoxy Dipping Works
A typical process is:
Pre-Treatment → Drying → Epoxy Dip → Controlled Withdrawal → Draining → Flash-Off → Curing
The product is immersed into an epoxy coating bath and then withdrawn under controlled conditions.
Advantages
Complex Geometry
Immersion can provide coating contact with surfaces that are difficult to reach with spray equipment.
Reduced Overspray
Unlike conventional spraying, the coating is contained within a tank rather than being dispersed through the booth as airborne overspray.
Controlled Process
The system can control:
- Immersion time
- Immersion depth
- Withdrawal speed
- Bath temperature
- Coating condition
- Draining time
When Is Dipping Suitable?
Epoxy dipping may be considered when:
- Components have complex geometry
- Large surface coverage is required
- Internal/recessed surfaces need treatment
- Consistent immersion is beneficial
- Production volume justifies a dipping system
- The epoxy formulation is designed for immersion application
When Spray Coating May Be Better
Spray coating can be preferable for:
- Very large products
- Products that cannot fit into a tank
- Rapid color changes
- Multiple coating colors
- Applications requiring selective coating
- Products requiring very different coating thicknesses across surfaces
Designing the Dipping System
A complete system may include:
- Dipping tank
- Circulation pump
- Filtration
- Temperature control
- Level monitoring
- Custom transporter
- Lifting mechanism
- Drip collection
- Flash-off zone
- Curing oven
- PLC / HMI
Custom Tank Transporters
For large industrial components, we can design custom transporters that control:
- Horizontal movement
- Vertical dipping
- Immersion depth
- Dwell time
- Withdrawal speed
- Product rotation
This allows the dipping process to be integrated into an automated production line.
The Right Question
The choice should not simply be:
“Dipping or spraying?”
It should be:
“Which application method provides the required coating performance, production capacity, flexibility and operating cost for this product?”
We can evaluate the product, coating chemistry and production requirement and recommend an appropriate system configuration.