Every boat owner meets the same moment eventually: the antifouling paint is twenty layers deep, it's flaking in sheets, and the yard says strip it before anything new goes on. You can spend a week under the hull with a scraper and a respirator, or a blasting crew can do it in a day. We handle abrasive blasting Vancouver wide, and hull work is some of the most exacting of it, because the target is the paint and never the gelcoat or plate underneath. Here's what the process involves in BC, when in the season to book it, and what actually moves the price.
Why Hulls Get Blasted Instead of Scraped
Antifouling paint builds up season after season, and past a certain thickness it stops bonding. New paint applied over failing layers peels with them. That's money over the side. Blasting takes the hull back to a sound base in hours rather than days, and it does something a scraper can't: it removes paint evenly, without the gouges hand tools leave in soft gelcoat. On steel and aluminum hulls it goes further, cutting out rust and profiling the metal so barrier coats actually grip. The other reason is simply health. Old antifouling contains copper and sometimes worse, and dry scraping puts it in the air around you. A contained blast with proper collection keeps that material managed instead of inhaled, and disposal is handled as part of the job rather than left in a pile behind the boat.
The Process: Media, Pressure and Protecting the Gelcoat
Hull blasting is a light touch done at volume. Gelcoat forgives nothing. The crew works at lower pressure with softer media than structural steel work, because gelcoat is only about as thick as a credit card and a heavy hand cuts through it. The usual approach strips the antifouling and stops at the barrier coat or gelcoat, leaving a lightly keyed surface that new bottom paint bonds to well. Fibreglass, steel and aluminum each want different media and pressure, which is why our marine and auto blasting Vancouver crews test a small patch before committing to the whole hull. Containment matters as much as technique. The boat gets skirted with tarps, spent media and paint chips are collected underneath, and the yard's rules for hazardous debris are followed to the letter. Expect masking around through-hulls, transducers, zincs and trim tabs before a single pass is made. Blisters, if the hull has them, show up clearly once the paint is off, which makes the day of the blast a sensible moment for a proper hull survey.
Timing It Around BC's Haul-Out Season
In the Lower Mainland, hull work follows the haul-out calendar. Yards fill up fast in spring when everyone wants bottom paint before the season, and again in fall as owners winterize. Booking a blast in that spring rush means competing for both yard space and crew time. The quieter window is late fall through winter. The boat is already out, the yard has room, and a stripped hull gets the full off-season to dry out before barrier coating, which matters for older fibreglass that has taken on moisture. Winter blasting in BC is entirely workable since we're rarely fighting hard freezes, and it puts you first in line for spring painting instead of last. Line up the painter before the blast, not after, since a stripped hull shouldn't sit bare any longer than it has to. If your yard is on the Fraser or anywhere around Metro Vancouver's marinas, we can usually work within their scheduling and containment rules, or come to the boat with a mobile setup where the yard allows it.
What Hull Blasting Costs and What Moves the Number
Hull work is quoted by the boat, not a flat menu. Two thirty-footers can be entirely different jobs. The variables that matter: hull length and shape, how many layers of paint are on it, whether the target is a light key or a full strip to gelcoat, hull material, and how much masking the fittings need. Access plays in too, since a boat packed tight between others slows the containment setup. As a frame of reference, most residential jobs run $300 to $800 depending on surface size and condition, and a full hull strip on a mid-size boat typically sits above that band, reflecting a day of contained, careful work. Multi-boat bookings at the same yard bring the per-boat number down, which is worth raising with dock neighbours before haul-out. Ask for the estimate in writing with containment and disposal included, so there are no surprise line items when the boat is already on stands.
Frequently Asked Questions
Will sandblasting damage my boat's gelcoat?
Not when it's done with marine-appropriate media at reduced pressure. Gelcoat is thin, so hull work uses softer abrasives and a lighter technique than structural blasting, usually stopping at the barrier coat. A reputable crew tests a small patch first and adjusts before touching the rest of the hull.
When is the best time of year to blast a hull in BC?
Late fall through winter, for most owners. Yards have space, crews have availability, and a stripped hull gets the whole off-season to dry before barrier coating in spring. BC winters rarely freeze hard enough to stop the work, and you avoid the spring haul-out rush entirely.
Can old antifouling paint just be painted over?
Only if the existing layers are still bonding well. Once antifouling is thick, flaking, or lifting, new paint fails with the old layers underneath it. Stripping back to a sound base costs more up front but stops the annual patch-and-repaint cycle that thick buildup causes.
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