The most common and most likely answer to this crossword clue is the 8 letter word E[NAME]L
E
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N
A
M
E
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L
Buddy explains!

The straight part
We know that "Paint" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case paint = e[name]l.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does E[NAME]L mean?
E[NAME]L noun- An opaque, glassy coating baked onto metal or ceramic objects.
- A coating that dries to a hard, glossy finish.
- The hard covering on the exposed part of a tooth.
- A cosmetic intended to give the appearance of a smooth and beautiful complexion.
- To coat or decorate with enamel.
- To variegate with colours, as if with enamel.
- To form a glossy surface like enamel upon.
- To disguise with cosmetics, as a woman's complexion.