Hi Bob

Painting won't change any of the properties unless the paint contains
metals or heavy carbons.

You might consider Krylon over Rust-Oleum though.
Almost everything I have ever used Rust-Oleum on, it has taken two or
more coats and then it peeled off in many spots within the first few
months.
A number of years ago we painted two commercial lawn mowers, one with
Krylon and the other with Rust-Oleum, both with the same prep before
painting.
We had to repaint the Rust-Oleum painted mower the following year, the
Krylon mower was never repainted, nor did it need it.

TTUL
Gary