Modern Offshore Cruisers



* Construction and repair using all boatbuilding materials

* Engineering and metal fabrication

* Engine, Transmission, Genset and Hydraulic servicing and installation

* All interior construction and finishing

* Painting

* Electrical

* 8.5 meter beam and 80 ton travel lift


* More than 30 years of servicing, maintaining and repairing offshore cruisers
* Performed a large number of internal and external refits on offshore cruisers
* Major refit of interior on 75 ft. offshore cruising launch
* Manage maintenance and prepare boats the cruising season
* Store and manage maintenance work for overseas owned offshore cruisers over the off season in preparation for the next cruising season

Case History on an Offshore Cruising Launch

Windana is a 75ft steel cruising launch. It has been coming to Robertson Boats since coming up to Auckland because of a change of ownership. It was first brought to the yard in 2010 and it was discovered that the boat was rusting badly. The internal surface of the hull and some of the frames were rusting along with the area below the waterline under the paint.

It was decided that the area below the waterline was to be sandblasted back to clean, white steel and recoated with a new paint system to protect the hull. It arrived at the yard and was hauled out and water blasted ready for work to commence. The shafts, props, rudders and stabilisers were removed.

To do this without making a major mess of the rest of the boat and potentially ruining the rest of the paint work by rusty dust landing on it and staining it we constructed a sealed tent around the bottom of the boat from the waterline down to the ground to contain the dust. Next we masked around the waterline with masking tape and over laid it with tin tape to protect the topside paint work from being damaged and so we were left with a clean accurate line to paint to.

The stabilisers and rudders were hung inside the tent to be blasted. The sand blasting was done removing everything back to clean, white steel which took a few days. The sand blasters then came back early the next day and swept blasted the hull to make sure it was clean, then mess was cleaned up and the hull cleaned off to remove any dust. The sweep blasting was done to make sure that the hull was clean and any rust that may have been forming on it since the blasting was done was removed so the painters were painting onto a clean, rust free surface.

Next the painters worked on building up a good base of primer to protect the hull. The tent was removed and the hull was antifouled. It was launched in time for the Christmas holidays.

The next two visits were to take care of the aft and forward cabins. A team consisting of cabinetmakers, electricians and engineers was sent in to strip out all the cabinetry, wires, hoses and anything else that needed to be removed so all that was left was the frames and hull. All the components were labelled and carefully stored away.

The next job was to mask off the rest of the boat to protect it from the dust, set up the extractors and seal off the cabins so all the sandblaster had to worry about was not missing any bits. Once that was done the sandblaster went into the boat, was sealed in the cabins and got to work stripping all the surfaces back to clean white steel.

Now that was complete, the cabins were cleaned out thoroughly and were masked for painting. The painters applied the same paint system to the inside of the hull as they did to the outside, being careful to ensure all the bare steel was painted and sealed in. Once the paint had hardened up the team was back in there reinstalling all the cabinetry and fittings, making any necessary improvements, replacing old hoses and wiring etc.

The job was completed and the boat was launched, the systems were run up and tested and all was good.

Windana came to us again with a leak in the fly bridge deck that the owner wanted fixed. After some investigation the extent of the problem was discovered. The fly bridge deck was riddled with rust and it was decided that all the teak was to be stripped off so a proper repair job could be done. There were numerous fastening holes that had not been properly dealt with on their removal (by a previous boatyard), instead of welding them up they were simply filled with bog and this was the reason for the rust.

The team got to work removing the soft hatches for engine removal, which were also rusty, and cleaning them up. All the fastening holes were welded up and an area that was particularly bad was cut out and a new piece was welded in. Now the deck was masked off and it was sandblasted back to clean white steel.

A new paint system was applied sealing up the steel and building up a good base for protection. All the corners of the deck were coved again with microballons as they were stripped away by sandblasting. Now an undercoat was applied over everything. It was then knocked back and top coated.

Instead of laying over the deck with teak again a rubber non-skid mat was used in its place. Now the internal surface of the cabin top had to be investigated along with a small patch of rust around one of the front windows. It was revealed that the front windows were suffering from rust damage as well, for some of the same reasons as the fly bridge deck.

There were fittings that had been removed from around the windows and the holes they left had been filled with bog and not welded over and the original window installation was a bit dodgy. The rust was around 4 of the 5 front window frames, and the majority of the internal surface of the cabin around the windows and down where the water had run behind the helm station. In order to see the extent of the damage the cabin was stripped. The internal surface of the cabin top was also badly rusted from the water getting down through the old fastening holes.

Once the extent of the damage was revealed the cabin was masked off in preparation for treatment. A section of the cut out for one of the windows had to be removed and replaced with a new piece of steel welded in its place. The rust on the cabin top was cleaned off with stripping disks on grinders along with the rust from the leaks around the windows. It was taken back to clean steel making sure no bits were missed. The cabin was then cleaned out and the painters applied a new paint system to seal in the steel and build up protection. All the components were then installed back into the cabin with the addition of new insulation and LED lights in the headliners.