Been over a year and I'm finally gonna get it in gear to start finishing this helmet. One of the reasons for my procrastination is the well known psychological condition called 'HDPE paint anxiety," the symptoms of which
are shown below.
The wrinkles in the paint happen a few minutes after applying a second coat of Krylon Dual Superbond. From my testing it happens whether I wait 10 minutes, 1 hour, or 1 week after the first coat, with or without adhesive promoter applied before the first coat. The best results I've gotten are with adhesive promoter followed by coats of Rust-Oleum Gloss Protective Enamel, so I'm going back to using that.
The messed up paint job is from a second helmet (beige HDPE). The white HDPE helmet paint is still in good shape, just a few cracks which I KINDA fixed by carefully spreading some white all purpose glue parallel to the seams of the crack.
The lower left picture is just to show the seam in the cap&back which is also found in original helmets, so it's appropriate to leave that intact. It's not a flaw. It may have been part of the original mold or something done to hold it in place during the pull to better define the curve transition and the undercut at the back. Pulling hot HDPE is a lot like pulling melted candle wax.
It's a hobby with lots of opportunity to learn, especially through trial and error, but that's OK!
