So, why do we paint wooden boats? Or any other boat for that matter? The first part of that question is easy. Boats look much smarter and better if they shine and gleam a bit... it's only human nature after all. The second part to that question is: We want to protect it. Ok, from what? Well, wood rots if you don't paint it, right? - wrong! Wood left to its own devices does not rot. Wood only rots as a result of its environment. There are multiple cases of how, plain untreated wood can last for centuries as long as it is in the correct environment. There are basically only a few elements that start wood rotting. Biological attack from spores, fungi, temperature, high humidity or total absorption, physical attack from marine borers and crustaceans that allow ingress to all the other elements aforementioned.
Don't let's forget that polluted waters can degrade timber to the point where it will rot....we'll add chemical attack to that list too. So, in view of all these very compelling reasons we protect our boat by painting it to coat it fully against these assaults.
PREPARATION OF TIMBER
The actual preparation of timber can cover a range of differing requirements. If your boat is a new build you won't have to go through many of the preparatory stages that an older boat may have to go through. With some forms of boatbuilding where a boat has been built by a different method such as strip planking or cold moulding, we paint the boat as if it were a fibreglass boat, due to the fact that either layers of fibreglass cover the timber or that the timber has been coated with epoxy that does not allow conventional paints to adhere to it properly. However, if we wish to protect bare timber then we use a different tack. Timber in its bare natural state has millions of thin hollow tubes running through it, constructed of cellulose in its natural form. We have to seal these tubes to prevent the ingress of water into them. Therefore we seal and coat the timber first of all.
The first thing we do is to clean and remove any loose and flaking or damaged paint plus any dirt that remains on the hull - sounds easy if you say it quick but it must be done! If necessary (and most times it is) degrease the hull using a proprietary paint degreaser after removing all dust preferably with a vacuum cleaner. Don't forget it won't be absolutely necessary to get all the hull back to bare wood just dry, clean, grease and dust free.
FILLING AND IMPERFECTIONS
Obviously, not many timber craft are perfect on the outside. There are many blemishes, cracks, imperfections and splits both large and small to deal with by filling them and sanding them flush before priming the boat. It's a bit of a chore but time spent here will reward you with a boat that will certainly look better plus have a longer life. Some folks fill these holes and imperfections in timber with epoxy filler but it is not a good idea. Sometime later, for example, when the boat has to undergo a repair, it will be the very devil of a job to remove the epoxy from a fastening hole. It's best to use some kind of proper timber filler that dries hard and fast but is never that hard that it can't be removed later on. For example, painter's glazing compound is a fairly hard setting soft paste that can be quickly applied then sanded and painted satisfactorily. Carvel boats usually have their seams filled fair with a special seam compound AFTER the boat has been primed. Once the boat has been filled and faired smooth and all dust removed we are ready to put some actual paint on. Remember, the difference between a professional paint job and an amateur is the PREPARATION!
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