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Be aware that the application of urethanes in any quanity other than patches generally requires the use of specialized spray equipment and facilities, I suppose this is why Maravia only sells their finish in small batches. To do an entire raft correctly, it is most likely a job for a pro unless one has an extensive working knowledge of these materials. As far as coverage estimates, you need to figure out the square footage, the required material thickness (DFT), the percentage of solids in the coating, overspray loss and then run the math to gain the material amounts.
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