You can use same peroxide treatment on the bulkhead caps, it wont warp them. Just don't boil the peroxide off them afterwards, they have a low melting point and will warp very quickly. Think it may have been my threadhondaman wrote:
2.) Does yokomo white plastic respond to peroxide like Associated? Yup.. Did mine for my 870C and Works 93.. Came out great.. Just don't try to dye the bulkhead caps.. I hear they warp (there was a thread somewhere).![]()
Shawn

I found this out the hard way with 6 re-freshed caps. Still haven't recovered from that!

And to put the boot in, I only boiled the Yokomo caps because my previous lot of peroxided associated parts that I didn't boil off were left with my mint team truck parts and stripped the anodizing!