A double-coat system is a method of applying two coatings to the same substrate. The most common two-coat system involves laying down a primer, curing it, and then applying and curing a topcoat. Below, we've compiled a list of tips to help you better double-coat your substrates, so read on for more information!

Considerations for applying a double-coat system

1. Test any product on a panel or part before applying any coating. This way you can really see how the product works and can make any necessary adjustments before coating the part.

2. During the pretreatment process, make sure the part is properly rinsed and dried. Also, water stains may form as the pretreatment agent dries on its own. Even if you apply paint over these water stains, you may see some dry spots under the coating.

3. A good surface is critical to the coating! If you do not have a good grounding, you will experience star or reverse ionization problems. Stars look like you have sand money on the surface. Anti-ionization makes the coating look very rough like a grapefruit peel. This means you need to clean the surface of the object so that the metal is in good contact with the metal.

4. Good film thickness is key. A thicker film structure also reduces the charging ability of the topcoat powder when using a two-coat system.

5. Clear coat is usually well applied, but the thicker the clear coat is, the more opaque it becomes, and usually appears milky white. So don't apply it so thickly over the clear topcoat that you may not even realize you are doing it.

6. Do not overbake between coats. Doing so can cause adhesion problems between coats.

7. Using the same brand of powder for both coatings will allow you to maintain some consistency.

8. Dust, dirt, and even oil on your hands can cause trouble on the line, for example from leaving fingerprints on the paint. So don't leave it too long between coats and don't handle the substrate between applications or curing. Prevent contamination of the product and keep the product sealed in a container when not in immediate use.

9. The curing requirements for both coatings are important. If you are using a conventional curing primer, make sure it is fully cured or almost fully cured before applying a low-cure topcoat. If a second coat is applied before curing, the primer will likely never fully cure.

Summary

The double coating is a great way to enhance and protect substrates from the weather. But whether or not to use a dual coating system depends on what you are coating and what you need the product to achieve.

Are you looking for a reliable double-coating line for your business only? If so, then you have come to the right place, you can always browse our website to learn about the quality double coating lines we sell, and feel free to contact us with questions.