Reddit reviews HDPE (High Density Polyethylene) Round Rod, Opaque Off-White, Standard Tolerance, ASTM D4976, 1" Diameter, 12" Length
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HDPE is a rigid, tough plastic that offers good chemical resistance and low moisture absorptionColor is opaque off-whiteMeets ASTM D4976 specificationsStandard tolerance
A very sharp skew point used as a negative rake scraper can scrape through it easily without chipping the layers on the tubes.
I highly recommend grabbing a pair of delrin or HDPE bushings to use for the CA finish process.
Cheapest/most economical way is to get a chunk of HDPE somewhere online (or melt some into a block yourself) and make your own bushings. I purchase 1" HDPE rod and drill a 1/4" hole in the center, then shave them into pointed bushings so that the tube is centered. Every so often a skew to true up the bushing to a point again is necessary. You can get 6 pairs of bushings from a 12" rod for $12, or one set of bushings for $11.
The really nice thing about finishing them like this is that the thin CA has a change to "lip" over the edge of the tube and seal/stabilize the ends a bit more. A piece of 600 grit sandpaper on a flat surface and you can sand away any excess CA on the ends of the tubes.