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#1
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Thinner for bottom paint
I have bottom paint on my 1991 V20 cuddy (from the days when it spent its like on the ocean). It is now trailered, so I really do not need bottom paint. However, I do not want to go the time and trouble of stripping it, at least not this season. I have some old West Marine Copolymer ablative bottom paint which needs to be thinned a bit that I would like to you use to touch up some areas. Can I used regular old paint thinner or do I need to buy the expensive $15-$20 thinner from West Marine?
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#2
06-08-2011, 01:59 PM
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I'm surprised it's not on the can.
Read the cleanup instructions. Usually whatever the cleanup liquid is will work for a reducer. Only problem is knowing how the thinner works. Mineral Spirits may stay wet for a while and Acetone might dry quickly and blush.
__________________
 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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#4
06-08-2011, 02:48 PM
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to my knowledge thinners is thinners. but i could be wrong ....as i learn something new everyday. good luck nip
__________________
1987 Dual Console / 2007 200 hp E-Tec 
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#6
06-08-2011, 04:16 PM
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I have kept my boats in the water for 34 years....for 34 years I have used regular mieral spirits paint thinner to thin bottom paint(all diff. brands) with ZERO issues. My vote- cheap paint thinner
__________________
'78 V20 Center console "Sea Deez Nuts" 200 Merc Gloucester Pt, Va
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#7
06-08-2011, 07:57 PM
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If I was going to paint the entire bottom, I would probably go with the good stuff, but since I am only doing touch up work, and do not really need the protection of the bottom paint, I think I will go with the cheap stuff. Now, that raises another question I have always wondered about: what is the difference between paint thinner and mineral spirits?
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#8
06-08-2011, 08:29 PM
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I did a search I found this information ...
Cost of Paint Thinner vs. Mineral Spirits Usually, paint thinner is cheaper to purchase, and by a pretty good amount. The difference between the two can be up to 100%, or double the cost for mineral spirits. The reason for this is that the mineral spirits receives additional, more thorough refinement, which takes more manpower. This cleaning of the material also is what makes it less noxious to use. The bottom line is that it takes more work to produce mineral spirits than paint thinner, and just as there is a price difference in an oil change and a cooling system flush, so there will be a difference in these 2 products. Effectiveness of Paint Thinner vs. Mineral Spirits Many people have developed preferences on the use of mineral spirits or paint thinner. Many prefer one over the other. However, the observant user will find that the mineral spirits tend to be more effective in terms of solvent properties and cleaning capabilities. This is most likely due to the fact that it is a much more purified form than paint thinner is. Many artists prefer mineral spirits due to the substance's ability to quickly clean about any painting utensil that might be used. It is also a more effective solvent, and is the preferable thinning fluid. One argument is that because it is more effective overall when used in this way, that it makes up for the difference in cost compared to paint thinner.
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#9
06-08-2011, 08:53 PM
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NYMack, you are really kind. Thank you. I somewhat dissed your advice to use the paint thinner specified for the particular bottom paint being used, yet you took the time to look up the difference between the cheap alternatives to what you recommended. That was really nice of you to do that, and is so symbolic of the camraderie on this website. Thanks, NYMack, Macojoe and all involved in making this forum available.
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