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  Hull blistering potential of trailered boats

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Author Topic:   Hull blistering potential of trailered boats
highanddry posted 05-15-2007 05:23 AM ET (US)   Profile for highanddry   Send Email to highanddry  
I am sure this has been discussed before but my question is more concerned with the likelyhood of blister with an unpainted hull in fresh or salt water for periods not exceeding one to two weeks at a time with usually several weeks drying time between dunkings. Do such boats generally need bottom coatings? Are they candidates for blisters? I would prefer not to paint our hull. Is blistering a problem for boats that spend the vast majority of their life on a dry trailer or for that matter a lift.
HawaiianWhaler posted 05-15-2007 08:11 AM ET (US)     Profile for HawaiianWhaler  Send Email to HawaiianWhaler     
IMHO there shouldn't be any concern for blistering on a trailered Whaler based on my own Katama having none after 23 years, and never having painted the bottom. Again IMHO short stints wet berthed should also be of no concern based on a buddy's Montauk being nearly continuously wet berthed for years with no blistering (and no apparent water intrusion into the foam, based on normal level flotation with three(!) outboards on the transom). Of course, here in Hawaii there's not much water temperature variation at his berth. Everything here is saltwater, and while he did have his Montauk bottom painted at one time, it's long since worn away.
highanddry posted 05-15-2007 02:01 PM ET (US)     Profile for highanddry  Send Email to highanddry     
I have done some studying on blistering and really there seems to be no solid concensus of the actual conditions required to promote this phenomena. I also find it strange that other manufactuers do not mention blistering. I have read though several on line owners manuals for other brands of boat and they simply do not mention this. We have never had blistering on any boat we have had in our family so I was just curious about blistering in regards to other CW posters and their thoughts on it with Boston Whalers.

Based on what I have found on the subject of blaistering, boats that are stored principlly on trailers should not be concerned with blistering which Boston Whaler claims is the ressult of osmosis into the gell coat and under the gell coat and even into the glass layers. I wonder if the foam cored construction increases the likelyhood of blistering or is Boston Whaler simply paranoid about it.

Anyways, thanks for yor answer, it reinforces my thoughts on the subject.

Mobjack posted 05-16-2007 12:12 PM ET (US)     Profile for Mobjack  Send Email to Mobjack     
While I am sure blistering can occur in a whaler, I have never seen it in...six hulls now. Mine is twenty four years old, spent life on trailer, on lift, in slip, no blisters. It has bottom paint. First montauk we ever had in 1978, life spent on trailer in and out of water, no blisters. None of them have ever done it under any conditions. I've never seen anything I would even remotely think of as blistering.

Dad's Nantucket has spent the last four years on a lift, getting dunked for the day and back on the lift for a week, and the only noticeable problem with his non painted bottom is that even with those short periods in the water, it has assumed that tea colored tint from our southern Ches Bay waters. Not severe, and we plan to clean it off this spring again, but no blisters.

Unless you have seen it on someones boat and can verify the probable conditions that were to blame, I would not worry too much about it.

podosky posted 05-16-2007 04:22 PM ET (US)     Profile for podosky  Send Email to podosky     
I too had the same concerns about hull blistering. I had consulted my dealer. The owners of the dealership, and the employees who have Whalers, all have their bottoms unpainted. They had recommended that I consider doing the same. According to the dealer, a painted bottom in our area negatively affects resale value, and no one at the dealership has had blistering after extended periods in the water.

We have no bottom paint and have left our Whaler in salt water for up to 10 days and in fresh water for up to a week. We have not had any problems with blistering of the gelcoat.

boatsalltheway posted 05-16-2007 07:51 PM ET (US)     Profile for boatsalltheway  Send Email to boatsalltheway     
My '75 Katama spent its whole life being in the water for about 3-4 months per year and on the trailer during the rest of the year. This is on a freshwater lake in Washington. No bottom paint, and no blisters so far except for 2 on the side up towards the top, that doesnt even get submerged in the water. That is strange to me, but none other than the 2, there are no others. I wouldnt worry about it, but maybe I am just lucky.

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