Originally Posted by Bigmuz7
Which is fine on a trawler
but I think your Arab Sheik might be annoyed if you attacked his GRP Mega yacht this way
Who Knows Nasher .. maybe when they are that big .. they've got some metal in 'em ?
When you reach the size of super/mega/gigayachts the vessel is steel, actually classified as a commercial cargo (12 or less guests + crew) or passenger vessel (12+ guests) depending on the build standards. To smooth out the imperfections the hull is coated with a roughly 5mm thick layer of levelling compound and finally a layer of gloss white paint is sprayed on.
The vessel is built around the engines, repairs are generally performed onboard and cranes fitted in the Engine Room for overhauls and repairs.
Should it reach the point that the engine needs removing, as has been said above, the vessel is drydocked and an opening cut into the side. The engine will be removed/replaced, then the opening is rewelded and work commences on restoring the paint job. The paint job may cost $1million+ as it may require the entire vessel to be repainted to colour match. The drying times and conditions for the paint means it can take 3 or 4 months to complete the paint job, either in a paint shed or scaffolding built over the vessel, dehudifiers and heaters installed, dust removed from the air etc.
Hope this explains!