Maintenance of Majorcan shutters

What do I need to do to maintain my shutters properly?

Every three years at the most the shutters need to be sanded with a 180 grit sanding sponge. Subsequently apply one coat of varnish or protector with a brush or airless spray gun.

What if it has been over 3 year since I have carried out any maintenance?

Sand the wood until reaching the healthy part of the shutter.
Apply a primer with a brush or paint gun.
Finally apply two coats of varnish or protector.

Important: When time between maintenance work is more than three years this work will become much more costly, involving an increase in the amount of hours needed for sanding, a primer will also need to be applied as well as two coats of varnish or protector which will not be necessary if a proper maintenance is carried out.