Carry spares of some sort if your boat has many plastic fittings. The most common areas of rig failure are at the terminal ends or any welds. The masthead crane, in particular, is subject to violent and extreme shock loads. Regularly inspect these areas closely, preferably with a magnifying glass. Avoid taping rigging whenever possible.
Tape traps salt water and speeds corrosion.
Where taping or otherwise covering rigging cannot be avoided, inspect beneath the tape regularly. Racers know that regularly lubricating the mast track greatly eases sail handling. A small amount of simple liquid soap applied to slides works well as a lubricant for short periods. Rebedding deck fittings . Clean-up is much easier if you tape off the area around the fitting you plan to caulk.