What is the seat pan material on 2018 F3's? Anyone know?

[pauly1]

Nylon 6/6, polyamide 6/6, is a general purpose, semicrystalline plastic. It has excellent temperature range performance and high chemical resistance. It also has low surface energy, minimizing sliding friction against another object, but also causing low wetability of a liquid on the surface. The plastic is often internally modified with impact additives and lubricants. As the material is made via a "condensation polymerization" process, that is, synthesized from a water solution, it has a normal moisture content of approaching 2% by weight, also causing difficulties with adhesives. (When we process PA6/6 for injection molding or extrusion, it must be dried to less than 0.2% to be able to achieve stuctural properties and maintain aethestics of the finished article.)

Sidebar: water absorption also affects other material properties. The first is it drastically improves impact strength. The downside is that it reduces tensile strength and flex modulus (it's weaker in tension but is also more flexible).

The semicrystalline molecular structure and high chemical resistance make it a difficult material to get adhesives to bond to. At minimum, a surface etch or primer will be needed, but it will be difficult to attain a structural repair using adhesives. To repair the crack, one might need to resort to a thermal bonding system and/or including a layer of structural material over the crack and use of a lap joint to provide necessary strength. (Note: the crack didn't just happen - it's due to an area of stress which exceeded the strength of the plastic. A simple butt-joint is not as strong as the parent material.)

Do an internet search with these terms "adhesive bonding to nylon 6/6" to get a range of explanations.