Peel ply and release film are both placed on the carbon fiber layup before curing. Many customers mix them up and run into trouble in post-processing.
Release film is a smooth non-porous film. After curing, peeling it off leaves a sealed, glossy, closed resin surface. This surface is clean and smooth for direct final finish. However, it is chemically inert. Glue or paint will struggle to stick firmly unless you sand the whole surface thoroughly. It is a good pick if you only need a neat finished look without further bonding.
Peel ply is a woven nylon fabric. When you tear it away after curing, it leaves a uniform matte, slightly textured surface with tiny micro-pores. This rough texture is ideal for bonding and painting. Adhesives and coatings can lock into the micro texture securely. No heavy sanding is required before gluing.
The downside is that the surface cannot be used as the final cosmetic layer. It needs top coating if you want a nice visible finish.
We often see customers order parts with peel ply and then ask for direct clear coat, or use release film surface and wonder why the adhesive keeps coming loose.
Tell us your next step clearly: whether you plan to bond other parts, spray paint, or use the carbon surface as the final outer layer. We will select the right auxiliary material for your carbon fiber sheets, tubes and custom molded components.
