The honest answer to "how much is osmosis treatment?" is: it depends. But if you know what changes it, you can judge a quote properly and avoid cheap-looking jobs that end up half-done.
Factors that set the cost
- Boat length and surface area: the job scales with the underwater area.
- Extent of damage: a few local blisters and a fully affected hull are very different.
- Drying time: the most variable item. The laminate must dry completely; this depends on climate and moisture level.
- Barrier-coat system: how many epoxy coats and which product affect the price.
Why no fixed price?
Most of the osmosis job is drying, and drying time can't be known exactly upfront. A quote that says "this much" without measuring moisture will either under-do the work or pad the risk into the price. The right approach is a moisture reading at the survey and a realistic range.
The hidden cost of a cheap quote
A job that applies a barrier coat before drying traps the moisture inside, and osmosis returns within a season or two. So the most expensive osmosis treatment is the one done twice.
To see your boat's condition clearly, we do a free survey and moisture reading and give an itemised quote under our fibreglass repair service. We explain what osmosis is in our osmosis guide and its signs in this article.
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