Picture: 1 shows different layers on polyester boats.
Picture: 2 shows differnt layers on steel boats.
Picture: 3 Surface after torbo blasting. |
Osmosis to polyester boats and renovation of steel boats
Antifoulingcoatings protect the gelcoat or paint for building up algae at the bottom of the boat.
The slow solving antifouling has to be renewed every year. You can repaint the antifouling up to 7 times. Then you have to remove the rests totaly to get a clean surface to put new antifouling on.
Of course when it loosening faster you have to remove it earlier.
When you remove the painting it is useful to get a little roughness to get a good attachment with the new coating.
To do this use torbo with a blasting pressure of 3 bar and a blasting media of 0.09 to 0.25 mm.
Polyester boats
After removing the antifouling coating its possible to mesure the surface if osmosis occured. These mesure devices are mostly standard equipment on the yard. When no osmosis ocured you can put on a new antifouling layer.
When osmosis is recognized the infected layers (up to 6 layers) have to be removed.
To do this use torbo with a blasting pressure of 3 bar and a blasting media of 0.0 to 0.5 mm.
After removing the old paint layers you can see osmosis as small or bigger blisters.
After opening the blisters with torbo blasting, these spots have to be treated after. To treat the osmosis remove the gelcoat around the blisters and remove the damaged polyester till the good layers appear.
After this let the surface dry from the moisture and rest chemicals. Be sure you create nice edges from the rest (good) gelcoat to the laminated polyester.
Little surface roughness is neccessary to a good preparation for the next treatment.
Is there to much osmosis the total gelcoat has to be removed from the polyester until the good the surface appears.
To remove the gelcoat with torbo use about 5 bar and blasting media from 0.0 to 1.0 mm.
When you finished blasting you need to built up the polyester layers and after this put on the gelcoat. The gelcoat should be have a thickness from 1 to 2 mm. After this a finish coating or/and antifouling can be painted on.
Steel boats
Is there rust on the surface or can be rust under the coating you have to spot blast these places till the clean metal. These places get a certain surface roughness with very nice edges to the good paint.
Is there a lot of rust the total boat has to be blasted till the bear metal.
This can be reached by torbo blasting with a pressure from 5 to 7 bar and a blasting media from 0.5 to 1.4 mm.
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