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Paint pimpleing


Ray T

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Just a thought ! If by any chance someone had been grinding steelwork in the vicinity of your boat and the dust had landed on your paintwork- the result could well be lots of stable orange spots all over the place. They certainly aren`t symptomatic of a problem with either the paint or it`s application.

Years ago when hiring, I had this. Returned from holiday and a day or two later my car broke out in "rust measles", even the plastic bits! I concluded it was the result of the boatyard angle grinding near my car. After a few months thee rust spots disappeared, presumably because the tiny bits of steel has rusted completely away.

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Just a thought ! If by any chance someone had been grinding steelwork in the vicinity of your boat and the dust had landed on your paintwork- the result could well be lots of stable orange spots all over the place. They certainly aren`t symptomatic of a problem with either the paint or it`s application.

 

 

Thanks Phil, this was my conclusion too.

 

Now, any thoughts on why the squirrel grey paint I ordered dried sky blue after appliaction?

 

:)

 

Mtb

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Me last thought ! Why is it that when one business ( mayhap a paint making business) explains a paint related problem no one is willing to believe them while another business , quite often less qualified to actually KNOW the answer (say for instance a boat painting business) is seen as a paragon of honesty ? It has always been so and I`d love to know why. Is a boat painter automatically more plausible than a manufacturer when something goes wrong? And remember please - I say this having made a living for thirty years as a boat painter !


someone shaving the wrong kind of squirrel next to your boat...

 

 

squirreledited.jpg?w=870

Magic ! Now - it would help a certain painter I know if you could identify a green one for us.

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Looking at the microblisters on my paint I would say it's symptomatic of bad application/ or bad preparation/undue diligence by the painting co.

 

I would however suggest that modern paints may be less forgiving or tolerant these days of bad practice during preparation and subsequent application.

 

Having been involved with professional steel coating (in outside applications) and seeing the intensity of independent supervision and monitoring undertaken I would not take too much notice of any paint shop who could not demonstrate adequate QA.

 

The issues can take more than a year to show up which muddies the water nicely.

Edited by mark99
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  • 2 weeks later...

I am no expert but I do know the paint bases have been forced to change within the past 5 years to make them more environmentally friendly. My friend has just had his steam boat Adamant cut back to the metal and repainted (August this year) and that has blistered already, like somebody has thrown sand into the paint but they are tiny blisters. I wander of modern environmentally friendly paints or primers are more prone to moisture ingress during application.

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I am no expert but I do know the paint bases have been forced to change within the past 5 years to make them more environmentally friendly. My friend has just had his steam boat Adamant cut back to the metal and repainted (August this year) and that has blistered already, like somebody has thrown sand into the paint but they are tiny blisters. I wander of modern environmentally friendly paints or primers are more prone to moisture ingress during application.

There will probably be a lot more now we have had a bit of snow

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A picture tells a thousand words.

 

I'm lucky <I think> in that you can't really see them unless you look real close. But they are there.

 

Here is the side of boat from a few feet away with 8" strip (from toprail to just below pinstrip) of raindrops wiped dry. You can't see any bumps but................

 

 

 

view1_zps7126c540.jpg

 

 

 

Look closer <close up photo below> and run your fingers down, they are microblisters. All down the boat, both sides from top down to bottom on the red and blue. I can only hope it does not get worse.

 

view1cu_zps6f9733ca.jpg

 

NB The painting was commissioned by the previous owner not me. Those of you considering lashing out good money for your repaint perhaps need to discuss this issue (which appears not uncommon) with your prospective painter beforehand.

 

Note - I am now fairly sure it's nothing to do with post painting products like wax because my boat has had a few (post paint products) applied, mainly plain carnuba wax - especially the rear sliding hatch and top hatches....... and they have no micro-blisters.

Edited by mark99
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I am no expert but I do know the paint bases have been forced to change within the past 5 years to make them more environmentally friendly. My friend has just had his steam boat Adamant cut back to the metal and repainted (August this year) and that has blistered already, like somebody has thrown sand into the paint but they are tiny blisters. I wander of modern environmentally friendly paints or primers are more prone to moisture ingress during application.

 

Which is why the person who painted our boat two years ago used Rustoleum primer rather than conventional enamel primer. Apparently it is based upon fish oil rather than mineral oil and is therefore excempt from the new EEC regulations. So far there has been no pimpling or blistering.

Edited by David Schweizer
  • Greenie 1
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Which is why the person who painted our boat two years ago used Rustoleum primer rather than conventional enamel primer. Apparently it is based upon fish oil rather than mineral oil and is therefore excempt from the new EEC regulations. So far there has been no pimpling or blistering.

Your painter, who I trained and who became my close colleague and friend ( with the occasional spat inevitably !) for over 16 years is a hell of a painter - but I don`t actually understand a word of what you have written here ! Perhaps it has not translated well at second-hand since this is a subject he and I have discussed at very great length over a long period. If there is a significant difference between the two types of primer it is that one dries with the film "open" and the other with it "closed". The former is more likely to harbour moisture than the latter if a tradesman does not take care or have the opportunity to counter this.

 

The next bit is not specifically a response to your goodself David and your painter is not targeted in what follows. There is a lot of heresay around about paints , primers and legislation and while there is a foundation for concern in some areas( see above re. primers for instance ) please remember that a little knowledge is a dangerous thing. None of the brushing primers commonly used by boat painters is water based incidentally. For goodness sake everybody, paint is a very broad term and you can`t have a "fits all" set of myths and half facts to cover the whole range of materials available for a huge variety of different applications. If I need an opinion on something specifically Alfa related I ask someone who has specialist knowledge - not a guy down the street who has "ad cars fer years mate. Wot ee don`t know ain`t worth knòwin`Them fancy so called experts `ll just bullshit yer..........."etc etc.

And, if there isn`t one such somewhere on your moorings - well, that`s a rare place you`ve got .

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Wise words Phil, I only wish that the same ethos could be applied to the profession of engineering. I went through all the hoops to gain the title of Chartered engineer taking many years including apprenticeship, university and post grad experience however in line with the sentiments you express it seems that in the UK anybody who has a screw driver is a an engineer especially if he can fix an engine. But like you say "Them fancy so called experts" ant a patch on a bloke thats had a lifetime at the university of hard knocks.

 

Not a lot to do with this topic but sort of reinforces your view that if you want an expert opinion, ask a qualified expert

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Your painter, who I trained and who became my close colleague and friend ( with the occasional spat inevitably !) for over 16 years is a hell of a painter - but I don`t actually understand a word of what you have written here ! Perhaps it has not translated well at second-hand since this is a subject he and I have discussed at very great length over a long period. If there is a significant difference between the two types of primer it is that one dries with the film "open" and the other with it "closed". The former is more likely to harbour moisture than the latter if a tradesman does not take care or have the opportunity to counter this.

 

The next bit is not specifically a response to your goodself David and your painter is not targeted in what follows. There is a lot of heresay around about paints , primers and legislation and while there is a foundation for concern in some areas( see above re. primers for instance ) please remember that a little knowledge is a dangerous thing. None of the brushing primers commonly used by boat painters is water based incidentally. For goodness sake everybody, paint is a very broad term and you can`t have a "fits all" set of myths and half facts to cover the whole range of materials available for a huge variety of different applications. If I need an opinion on something specifically Alfa related I ask someone who has specialist knowledge - not a guy down the street who has "ad cars fer years mate. Wot ee don`t know ain`t worth knòwin`Them fancy so called experts `ll just bullshit yer..........."etc etc.

And, if there isn`t one such somewhere on your moorings - well, that`s a rare place you`ve got .

 

I am not sure what you mean when you state that you don't understand a word of what I have written, I thought it was fairly clear, Maybe I have not accurately accounted for the lengthy phone discussion I had with John before I agreed to allow him to use Rustoleum rather than a conventional primer, but I do recall that the principal issue was that, being based upon fish oil, the primer would seal in any rust remaining on the steel surface, and with the manufacturing process not being hampered by new EEC manufacturing restrictions applied to converntional paints, was far less likely to lead to any pimpling,

Edited by David Schweizer
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I am not sure what you mean when you state that you don't understand a word of what I have written, I thought it was fairly clear, Maybe I have not accurately accounted for the lengthy phone discussion I had with John before I agreed to allow him to use Rustoleum rather than a conventional primer, but I do recall that the principal issue was that, being based upon fish oil, the primer would seal in any rust remaining on the steel surface, and with the manufacturing process not being hampered by new EEC manufacturing restrictions applied to converntional paints, was far less likely to lead to any pimpling,

Hi - no offence meant David. I take the point but it`s a question of how an individual values the different properties of a material. In my view the danger of moisture penetration is the greater evil than the danger of rust coming through from under the primer. Certainly with the quality of preparation done by John I would not have thought the latter would be an issue anyway. Without both characteristics of the material being taken into account your report of John`s conversation with you made less sense to me than

it may otherwise have done.

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