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Hull Blisters


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Failed Blister Repairs

A Case History and Solutions

John Williams is the proud owner of a ten year old 35' sloop. Prior to his purchase, he spent nearly a year searching around the country to find this particular yacht because it ideally suited his needs.

When the survey was conducted, there was only one significant problem with it: it had a scattering of small blisters on the bottom, which I usually refer to as "pimple rash" to differentiate this condition from considerably larger blisters.

The blisters in this case were no larger that 1/4" in diameter and had a density of about 2-3 blisters per square foot if averaged over the entire bottom area. Entire Article

Blister Repairs Part II

The Alchemist Still Hasn't Found the Philosopher's Stone

Over the course of the last several months it almost seems that I've been under siege by used boats with failed blister repair problems, some of which are illustrated by the photos below.

Reading the magazines and surfing around the web, you probably get the impression, as I have, that the blister problem is abating.

But taking a tour of the boat yards  I come away with an altogether different impression: the problem is now worse than ever. Much worse.

And so is the problem with the failure of repair efforts. Entire Article

Blisters and Warranties

An Owner's Dilemma

Not keep the boat in the water long? What should they do, put wheels on it? Sounds sort of like an auto manufacturer telling customers not to drive their cars in the rain because they will melt if they get wet. Entire Article

Blisters again?

The Wonderful World of Hull Blistering And Other Interesting Scams

Some surveyors have been insightful enough to ask why it is that some boats of a particular builder blister, while others of the same builder do not.

Or even why it is that some boats in a model line will blister and others not. Entire Article

Illustration of Water Absorption from a Hull Interior

Many Water Saturated Hulls Don't Blister

Quite a few people have written or called to tell us that they know of some proven methods of repairing bottom blisters that constitute a full and final solution.

Each of the systems and products offered by West, Ashland Chemical and International Paint were mentioned.

These, of course, are the most widely used products, but are also the most frequently involved in the failures, if only by virtue of their widespread use. Entire Article

My Wet Hull Won't Dry

The 8 Grand Conundrum

People with boats undergoing blister repairs often write us to say, "My boat has been drying out for six months now, and it still will not dry. The moisture meter readings are still as high as ever." 

The usual procedure is to just let the boat sit and "dry out" naturally by a process of evaporation.

Still others are erecting tents and what not and installing heaters or dehumidifiers to try to accelerate the process. And still they report that it's not "drying." Entire Article

Related Articles in other categories

To Buy or Not to Buy... A Blistered Boat, That is.

(in Buying a Boat or Yacht) A Blister Boat, That is.

One of the most frequently asked questions that a marine surveyor gets is, "Should I buy a boat that has blisters?" This is a question that I've wrangled with for many years, and after a great deal of research involving thousands of boats.

This essay will answer your questions a bit more directly than some of our more detailed blister essays, which many of you found hard to understand. That's understandable because this is a very complex subject. But be prepared that the answer is populated with a lot of ifs, ands, and buts. Entire Article

Avoiding the Blister Blues

(in Marine Survey related) Good Detection and Communication Techiques Critical to Avoiding Complaints

Hull blistering is a problem that has been with us for a quarter-century. One might think that over a period of twenty-five years this problem would have long since been solved, and no longer be much of a problem for surveyors.

Unfortunately, our research reveals that the blistering of boat bottoms continues to be a growing source of complaints and lawsuits against surveyors.

It seems to be one of those pernicious problems that just won't go away. In fact, the number of lawsuits against surveyors has actually increased dramatically in the last several years. Entire Article

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David Pascoe Power Boat Books Visit for his power boat books

David Pascoe - Biography

David Pascoe is a second generation marine surveyor in his family who began his surveying career at age 16 as an apprentice in 1965 as the era of wooden boats was drawing to a close.

Certified by the National Association of Marine Surveyors in 1972, he has conducted over 5,000 pre purchase surveys in addition to having conducted hundreds of boating accident investigations, including fires, sinkings, hull failures and machinery failure analysis.

Over forty years of knowledge and experience are brought to bear in following books. David Pascoe is the author of:

In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in 2001.

In 2012, David Pascoe has retired from marine surveying business at age 65.

On November 23rd, 2018, David Pascoe has passed away at age 71.

Biography - Long version



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