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On 1920s outboard motors, the original water-slide decals or early paint decals are very fragile. The goal is to stabilize them without dissolving or lifting the ink. Restorers usually follow these methods:
1. Clean Very Gently
- Use a barely damp soft cloth or cotton swab with distilled water only.
- Do not scrub and avoid detergents or solvents.
- Old decals were often shellac-based and can dissolve easily.
2. Seal the Decal
Once clean and dry, the safest preservation step is sealing.
Common approaches used by antique outboard collectors:
Microcrystalline wax (very popular)
- Products like Renaissance Wax
- Apply a very thin coat with a soft cloth.
- Buff lightly.
- Benefits:
- Protects from moisture and fingerprints
- Reversible and museum-grade
- Does not yellow
Clear acrylic conservation spray
- Light mist of an archival acrylic such as Krylon UV-resistant clear.
- Must be applied very lightly from distance.
- Used when decals are flaking and need to be locked down.
3. Avoid These (Common Mistakes)
Do not use:
- Automotive clear coat
- Polyurethane
- Lacquer thinner or cleaners
- Heavy polishing compounds
These can bleed the decal ink or cause it to wrinkle permanently.
4. Environmental Protection
Long-term survival also depends on storage:
- Avoid direct sunlight (UV fades decals fast)
- Keep in dry, stable temperature
- If displayed, avoid frequent touching.
5. If the Decal Is Lifting
A tiny amount of acid-free archival adhesive under the edge can reattach it, but this should be done carefully.
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