Cosflex Prime and Seal® is Coscom's own brand of strong, flexible, glue based  sealant/primer. It is intended for use with EVA Foam, Thermoplastics, Fosshape, fabric, paper, and wig fibers, but it has a limitless number of other applications. We have spent many hours research and experimentation to improve upon some of the weaknesses we found with other similar products to make Cosflex the perfect, self-leveling, smoothing primer and top coat. 

While it is most similar to Flexbond it does have some key differences to be aware of. It is much thicker allowing for faster application and requiring less layers to achieve a smooth even surface even on prous and irrecular surfaces such as worbla or polyfoam.

Cosflex can be thinned with water if desired but Do not add water directly to the Cosflex bottle. Mix water and Cosflex in a separate container. Adding water to the bottle will cause mold and make the Cosflex unusable.

Cosflex also has a superior bond when being used on plastic and foam surfaces, and is less prone drips and running.

Cosflex dries with a clear finish and remains flexible and strong with less of the "tackiness" common for other kinds of glue type primers, even as the coated materials bend, flex, and deform.

Cosflex is non-toxic, has minimal scent and is water soluble making it easier to clean up brushes and work surfaces.

Cosflex brushes on smoothly and easily. We recommend applying 1-3 layers, allowing the Cosflex to dry completely between applications to achieve the smoothest possible surface quality. 

If you are using your Cosflex as a top coat, we do recommend an additional clear acrylic sealant spray as a top coat to protect your project from water damage. 


For application on EVA Foam/ Thermoplastics: We recommend applying Cosflex evenly with either a bristle brush or a sponge brush to minimize brushstrokes. If the Flexbond is too thick it can be thinned with water. Do not add water directly to the Cosflex bottle. (See Above) We recommend 1-3 coats for maximum smoothness. Allow to fully dry between coats and watch for any drips/ runs.

Cosflex cannot be sanded. 

Store in a climate controlled area, Cosflex will become unusable if frozen. 

Product is available in 16 oz 


Please note when shipping during the Winter. If left outside upon delivery or in shipment Cosflex may freeze and turn solid. Once frozen Cosflex becomes unusable. In an effort to prevent this, based on the weather in your area you may be contacted to upgrade your shipping to next day delivery.

Full MSDS available upon request