A waterline marker is a small gauge that traces a level pencil line around a hull at a fixed height. It lets you paint above and below the line cleanly. The BB-10 sets that height anywhere from 25 to 150 mm and slides around the hull even where it curves.
Why the waterline matters for a finished-looking hull
Many ship kits are painted in two colors, one above the waterline and one below it. If that line isn't level, the whole hull reads as crooked, even when the build underneath is solid. A steady hand and a pencil can drift over a curved hull. A marking gauge can't.
What BB-10 does in under a minute
The BB-10 is a plywood gauge, 3.6 mm thick, that holds a pencil at a set height above a flat surface. Set its holder to the height you need, anywhere from 25 to 150 mm. Rest the hull on a flat, level table so its base sits steady. Slide the marker around the hull with its own base flat on the table. The pencil holder stays at the height you set. It traces one level line all the way around, following the hull's curve instead of cutting across it.
Why it's the most-ordered accessory
Among LMG's building-jig accessories, the BB-10 has sold more units than any other single item: 299 so far. It's LMG's most-ordered jig accessory of any kind. Marking the waterline is one of the first jobs a hull needs once assembly is done and before final paint.
Pairing it with a building jig
For hull assembly itself, the BB-06 ship building jig holds a hull square while the glue sets. Its base spans 250×550 mm, with supports up to 470 mm apart. Once the hull is built, move it to a flat surface for marking, then paint. The two tools cover two steps: the jig for assembly, the BB-10 for the line after.
FAQ
What is a waterline marker?
A gauge that holds a pencil at a fixed height above a flat surface. It traces a level line around a hull as you slide it along.
When do I mark the waterline?
After the hull is fully assembled and sanded, before you mask and paint it in two colors.
What height should I set the marker to?
The height your kit's instructions or plans call for. The BB-10 covers a working range of 25 to 150 mm.
Does it work on a curved hull?
Yes. The gauge's base stays on the flat table while it slides around the hull. The pencil traces the same height even where the hull's shape changes.
Related products: BB-10 Water line marker · BB-06 Ship building jig · Building jig collection
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