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Old 03-26-2020, 07:34 AM   #1
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Paint thinner for bottom painting

I am in the process of prepping my boat bottom for painting. I need to wipe the entire surface with a paint thinner, can any thinner be used? The manufacturer recommends Petitt 120 thinner but its expensive. Also any idea how much I would need to wipe a 41' down?
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Old 03-26-2020, 07:49 AM   #2
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I have used mineral spirits with acceptable results but someone once told me that mineral spirits leave some type of oil residue. I guess this makes sense but my thinking was that if I am using oil based paint why would this be a bad thing (if it is true).

Can't you read the label of the Petitt and try to duplicate that. It may be closer to acetone than mineral spirits.

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Old 03-26-2020, 07:50 AM   #3
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If it's just to wipe down for cleaning, I'd expect any thinner that dries without residue should do the job.
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Old 03-26-2020, 08:03 AM   #4
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Thank you!
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Old 03-26-2020, 08:05 AM   #5
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I am in the process of prepping my boat bottom for painting. I need to wipe the entire surface with a paint thinner, can any thinner be used? The manufacturer recommends Petitt 120 thinner but its expensive. Also any idea how much I would need to wipe a 41' down?



After all the work and expense to get the bottom painted, I wouldn't mess around. I would use exactly what the manufacturer recommends. A quart of thinner should do it.


One possibility to save money, see if you can get a copy of the MSDS and find out the main ingredient then see if you can buy that in a paint store.



Ken
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Old 03-26-2020, 08:11 AM   #6
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What was on there before?

After sanding or pressure washing an ablative..and no cotamination.....

I have never.wiped a bottom down except with a dry cloth after heavy sanding .
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Old 03-26-2020, 09:07 AM   #7
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Ablative paint as per previous owner. It looks like it has not been painted in a while.
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Old 03-26-2020, 09:31 AM   #8
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Wiping with proper thinner can't hurt I would guess....just in the future ....depending on your choices and system it may be overkill.
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Old 03-26-2020, 05:40 PM   #9
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I have removed all the barnacle remains from the bottom of the boat and roughed up the bottom with a 3m scotch-brite pad. I then washed the bottom. When it dried I ran my hands along it and I am still get powdered ablative paint to come off. Should I pressure was the bottom to remove the remaining powder? I'm thinking that it is an ablative paint and it should be coming off when I rub it?
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Old 03-26-2020, 06:10 PM   #10
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Yes. Ablative paint should always come off when you rub it.
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Old 03-26-2020, 06:45 PM   #11
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If you are going back with an ablative paint, just power washing is all that is usually required.
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Old 03-26-2020, 10:27 PM   #12
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I have removed all the barnacle remains from the bottom of the boat and roughed up the bottom with a 3m scotch-brite pad. I then washed the bottom. When it dried I ran my hands along it and I am still get powdered ablative paint to come off. Should I pressure was the bottom to remove the remaining powder? I'm thinking that it is an ablative paint and it should be coming off when I rub it?
You just need a clean surface. If you are working on bare fiberglass, then a toluene wipe is necessary. If covering a previous layer, then pressure wash after roughing should be good enough.

Mfg thinners are very costly and I use them strictly for thinning.
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Old Yesterday, 07:12 AM   #13
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I have always done a "quick" wiping off with acetone on a damp rag to remove dust.
I emphasize "damp" meaning just enough acetone to collect the dust.
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Old Yesterday, 08:49 AM   #14
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No dont use any oil (mineral spirits) or turpentine type based thinner. Always use proper thinner or you may create serious adhesion problems
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