Why does your plaster surface agent cause blistering? How to fix it?

On construction sites, when applying gypsum coatings using gypsum interface agents, blistering of the interface agent occasionally occurs. This phenomenon is typically caused by the following reasons:

Applying over uncured plaster: If plaster coating is applied before the surface has fully cured, and work proceeds urgently, the primer adheres to the uncured layer. This allows air bubbles to trap the primer, causing blistering.

Excessive Foam in the Plaster Primer: When applying the plaster primer, excessive foam can cause uneven dissolution, resulting in large localized air bubbles within the primer.

Improper Application Technique: Applying the plaster primer to the plaster coating surface using incorrect methods—such as using a brush that is too stiff or employing improper application techniques—can also lead to blistering.

The following techniques can help prevent bubbling in gypsum interface agent compound:

Apply Only After Gypsum Coating is Fully Dry: Ensure the gypsum coating surface is completely dry before applying the bonding agent to avoid bubbles caused by an undried coating.

Conduct preliminary tests: Before full-scale application, perform small-scale trials. During testing, adjust the solution ratio, control coating thickness, and refine application techniques to prevent blistering.

Appropriate Application Method: When applying the gypsum primer, use a suitable application method with a high-quality, appropriately sized brush. Apply the primer evenly to prevent excessive foaming and uneven coverage.

In summary, blistering of gypsum primer not only complicates installation processes but also compromises the project's aesthetic quality. To prevent blistering, thoroughly analyze potential problem areas before operation, conduct trials, and ensure proper application techniques are used to avoid unnecessary issues.