This handy primer is tailor-made for situations when you are using Tamiya CA Cement on difficult-to-cement materials such as polypropylene (PP), polyethylene (PE) or polyacetal (POM). Also use it if you want to modify your Mini 4WD or Educational Construction creations! Simply apply to both sides of the joint to be cemented, wait for it to dry, and then apply CA Cement! The 10ml bottle features a cap with brush for easy application! For use with PP (polypropylene): such as Mini 4WD car wheels, plastic document folders, etc. PE (polyethylene): such as poly caps, Educational Construction series wheels, etc. POM (polyacetal): such as Mini 4WD chassis parts.