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Hairline Lines Around a Hole Cut in the Tub Deck: Why They Appear and Why They Do Not Spread

▶Glossary6
  1. What You Are Seeing
  2. What to Do
  3. Cutting Cleanly the First Time
  4. Related Guides
  5. Common Questions
  6. Still Need Help?

Fine crack-like lines that show up on the deck shortly after you cut a hole for a switch, push control or canister are a surface effect of the cut. Ella's technical support has seen these lines before and has never seen them extend. The surface will be fine. The flange of the control or fitting you are installing sits over the edge of the hole, so the lines are hidden once the part is mounted.

What You Are Seeing

Cutting through the deck with a hole saw stresses the finish right at the edge of the cut, and short lines can appear in the surface around the hole shortly afterward, sometimes while you are still working. Installers who notice them naturally worry that a crack is starting. The team's experience is that these lines stay where they are. They do not grow into the deck, and the flange of the switch or fitting covers them once it is installed.

What to Do

  1. Take a clear photo of the lines with the hole and something for scale in the frame.
  2. Finish the installation of the control or fitting so its flange covers the cut edge.
  3. Keep an eye on the area during the first few fills. If a line ever lengthens beyond the flange, opens up, or catches a fingernail, send your photos and serial number to the team through ellasbubbles.com/support before doing anything else.

Cutting Cleanly the First Time

Most of these marks come from the cut itself, so prepare well. Confirm the location against your installation manual, and look underneath the deck before cutting so the saw does not hit an air line or wiring. If an air line is nicked, cutting out the damaged section and rejoining it with a coupling is the repair. Use a sharp hole saw sized for the part you are installing, and cut slowly with the deck supported for the cleanest edge. If the hole is for an aromatherapy canister, how the aromatherapy option works and what an aromatherapy canister is describe that part before you begin.

Common Questions

Are the small lines around the hole a crack in my tub?
They are surface lines caused by the cut, not a structural crack. Ella's technical support has seen them before and has never seen them extend. The flange of the control or fitting covers them once it is installed.
Should I fill the lines with something before installing the switch?
No treatment is needed. Install the switch or fitting so its flange covers the cut edge, and the lines stay hidden and stable. If you prefer, photograph them first so you have a record.
What if a line grows past the edge of the flange?
That would be unusual. Stop, photograph the area, and open a ticket at ellasbubbles.com/support with your serial number and the photos so the team can look at it before you continue.
How do I avoid the marks when I cut the next hole?
Check under the deck first so you miss air lines and wiring, use a sharp hole saw of the correct size for the fitting, and cut slowly with the deck supported. Confirm the hole location and size against your installation manual before cutting.

Still Need Help?

Open a ticket at ellasbubbles.com/support or call (800) 480-6850 and have your model and serial number ready.

Related guides

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