Quick answer: Haze can come from sanding scratches, moisture, incompatible finish products or incomplete cure; diagnose before adding more coats.
Look beneath the shine
Avoid using the same remedy for every material. Acrylic, wood and stabilized burl behave differently, and specific finishes vary widely.
Inspect the abrasive progression
For acrylic, friction heat can also affect appearance. Let the piece cool and follow the blank maker’s recommended polishing process.
Finish chemistry matters
Do not apply solvents or heating methods without manufacturer direction. Fumes can be irritating and surface damage can become worse.
When to redo the finish
Maintain a record of species, moisture conditions, adhesive brand, abrasives and curing conditions so the next project avoids the same uncertainty.
Use the moment haze appeared
On expensive figured wood, test the proposed remedy on scrap from the same batch before putting the original pen at risk.
Why another coat is not a universal fix
Applying more film over contamination can trap the problem. A thicker layer may also create a raised lip where the barrel meets metal. Solve the cause first, let any coating fully cure and keep accurate measurements at the pen ends.
Sources and further verification
Source links are included to help you confirm equipment specifications, accessories and recommended safety practices. Specifications may change with product revisions.