Kuwait is one of the hardest places in the region to keep a hull clean. The water is warm and salty, the sun is brutal for eight months, and the dust that settles on everything turns into a grinding paste the moment it gets wet. A hull that would last five years in a cooler climate needs attention here every few weeks.
Four things attack the boat at once. Salt sits on the surface and pulls moisture into every scratch. UV breaks down the gelcoat until it chalks and goes dull. Summer water temperatures above 30°C speed up marine growth, so barnacles and algae settle in days rather than weeks. And heat cycling between a hot deck and cool water works the seams loose.
Fouling is the expensive one: barnacles cost you speed and fuel and hide cracks until they get worse.
Fresh water is the cheapest maintenance you will ever do. Rinse the hull, the engine, the trailer and the anchor chain as soon as you are back. Salt left to dry forms a crust that lifts paint from the edges inwards.
The bottom of the hull, below the waterline, carries antifouling paint. Its job is to slow barnacles and algae, and it works by gradually releasing its active ingredient into the water. The topsides, everything above the waterline, carry a topcoat or gelcoat whose job is to look good and protect the laminate from UV.
You cannot swap them. Antifouling on the topsides will chalk and look terrible within one summer, and topcoat under the waterline will grow a garden in a month. Read the label before buying.
Repaint when the antifouling is thin and patchy, when growth returns within two weeks of a clean, or when you can see primer or bare fibreglass. In Kuwait, a berth boat needs antifouling yearly; a trailer boat can stretch it to two.
Sanding, masking and painting the bottom is realistic DIY work with shade and a respirator. Blisters, osmosis repair and anything structural belong in a yard.
A trailer boat escapes fouling but takes a beating from straps, rollers and dust, so check the hull where the rollers touch. A boat in a berth sits in growth all year, needs the anodes watched closely, and wants a scrub every few weeks in summer.
Once a month, walk the hull with a torch. Feel for soft spots, blisters and paint lifting at the waterline, and look at the anodes, propeller, trim tabs and the seams around fittings. Deal with anything suspect before the season, not during it.
Write the paint date and the anode swap into the Bahr app so you are not guessing next season.
Small habits beat big repairs. Check the tide before a low-water scrub, and the sea before you leave the house. The Bahr app gives tide times for Shuwaikh and Shuaiba ports, sea state and a catch log, free on Google Play: https://play.google.com/store/apps/details?id=com.q8dm.b7r