Once the boat is in the water, you can't reach most of the hull. Spring, while it is still on the trailer or stands, is the best time to deal with stains, oxidation and protection.
Book Early
In Ontario, most boats launch between late April and early June, and detailers get busy at the same time. Booking a few weeks before your launch date gives time for polishing and, if you want one, a ceramic coating to cure properly.
1. Inspect the Hull
Look for chalky oxidation, faded colour, waterline staining left from last season, and any scratches or chips. Rub a finger on the hull: chalk means it needs compounding, not just wax.
2. Clean the Hull and Waterline
Last season's waterline scum and yellow-brown tannin stains are easier to remove now than after another summer. Marine hull cleaners dissolve them without scrubbing the gelcoat.
3. Correct the Gelcoat
If the hull is oxidized, compounding and polishing now restores the colour and gloss before the season starts.
4. Protect It
Finish with a wax, sealant or ceramic coating. Protection applied in spring makes every wash during the season easier.
5. Deck and Non-Skid
Scrub the non-skid to lift ground-in dirt and mildew, and clean and protect any smooth deck fibreglass.
6. Vinyl, Canvas and Clear Windows
Clean the seats and apply a UV protectant. Clean canvas and clear vinyl windows gently, with products made for them, to avoid scratching and clouding.
7. Metal
Polish stainless rails, cleats and fittings to remove spotting and light rust before it spreads.
8. Interior and Cabin
Air out the cabin, clean surfaces and treat any mildew that formed over winter.
The Bottom Line
Spring is when your hull is most accessible and when stains and oxidation are easiest to deal with. A thorough detail before launch sets you up for the whole season.