Pinholes show up when everything else looks fine. The color is right, the gloss is on target, but after curing the surface still has tiny holes. For coating producers, this usually means extra work. Parts need to be recoated, production slows down, and customers start asking questions.

In most cases, pinholes are not caused by one single issue. They come from gas that cannot escape in time during curing. Once the coating starts to form a film, any trapped gas will push through the surface and leave marks. That is why this problem often appears suddenly when production conditions change, even if the formula itself has not been adjusted much.

Our Benzoin additive is used in powder coatings for this exact situation. It helps release gas at the right stage during curing, so the film can form more evenly. The material is supplied with stable purity and controlled melting range, which makes it easier to use in production without constant adjustment.

Where The Gas Comes From

Before trying to fix pinholes, it is important to understand where the gas is coming from. In most coating lines, there are a few common sources.

1 、Substrate Outgassing
Some metal parts, especially castings or galvanized surfaces, release air or moisture when heated. This happens during curing, not before. If the coating melts too fast, the gas gets trapped under the surface.

2 、Surface Contamination
Oil, water, pretreatment residue, or even dust can create gas when the part enters the oven. Even a small amount can affect the coating if it is not removed properly.

3 、Moisture In Raw Materials
Fillers or Additives that are not fully dry can release gas during curing. This is easy to miss, especially when switching suppliers or storage conditions.

4 、Formulation Imbalance
If the powder flows too slowly or cures too quickly, the surface can close before gas has time to escape. This is a common reason why pinholes appear after a formula change.

For most buyers, this is the key point. Pinholes are not just a surface problem. They are a sign that something in the process is not working together.

Why Degassing Additives Are Needed

When gas cannot escape naturally, the coating needs help. That is where Benzoin powder is commonly used. It works during the early stage of curing, when the coating is still melting and flowing.

Instead of letting gas break through the surface later, benzoin helps release it earlier, when the film is still open. This reduces the chance of pinholes forming after the coating starts to set.

Our benzoin product is designed for this role in powder coatings. It is used at a low addition level, typically around 0.3 to 0.5 percent, so it does not change the system too much but still improves surface results. For production teams, this is important because they need a solution that works without rebuilding the whole formula.

Why Not All Benzoin Performs The Same

In theory, benzoin is a standard material. In practice, not all supply performs the same in production.

What buyers usually notice first is consistency. If the melting behavior changes, or if the purity is not stable, the effect in the coating can vary from batch to batch. That makes it harder to keep the same surface result over time.

Our supply focuses on keeping this stable. The product is controlled in melting range and purity, so it behaves in a predictable way during curing. For buyers handling repeat orders, this helps reduce variation and makes production easier to manage.

This is also why many companies prefer to work with a stable supplier rather than switching based on price alone. In powder coating, small differences in raw materials can create visible differences on the final surface.

Process Still Matters As Much As Material

Even with a good degassing additive, process control cannot be ignored. Many pinhole problems come back because the production setup is not adjusted.

If the oven temperature is too high, the coating may gel too quickly. If it is too low, the coating may not flow properly. If the film thickness is too heavy, gas has a longer path to escape. If it is too thin, coverage may not be enough to hide surface defects.

That is why fixing pinholes usually requires both sides to be checked. The material needs to support gas release, and the process needs to give it enough time to work.

For B-end buyers, this is important when discussing problems with suppliers. A useful supplier does not only provide the product, but also helps look at how it is being used.

Why Consistency Is A Bigger Issue Than The Defect Itself

Most coating producers can fix pinholes once. The real challenge is keeping them from coming back.

In bulk production, inconsistency creates more problems than the defect itself. If one batch is fine and the next shows pinholes, it becomes difficult to control quality and delivery. That is where stable raw materials make a difference.

Our benzoin additive is used by buyers who need that stability. It is not just about removing defects in one trial. It is about keeping the same result across multiple runs, different seasons, and different orders.

For distributors, OEM coating brands, and project suppliers, this matters because their customers expect repeatable quality, not one good batch.

Conclusion

Pinholes in powder coatings usually come from trapped gas that cannot escape during curing. The source may be the substrate, contamination, moisture, or formulation imbalance. Fixing the problem requires both process adjustment and the right additive.

Benzoin powder is widely used because it helps release gas at the right stage, before the coating film fully forms. With the right dosage and stable material quality, it can improve surface smoothness without making the system more complicated.

If you are dealing with pinhole issues or planning to improve your coating quality, you can share your formulation or production conditions with us. We can help you choose a suitable benzoin solution and support your process with practical suggestions, making your production more stable and easier to control.