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Bottom paint - I know it's early, but lets talk about it!

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Masterb8tr

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I came upon this item "super ship bottom"  on the site www.supershipbottom.com, and it claims that you can just paint on the paint on the existing paint without sanding the bottom.


Has anyone used this product and what do they think about it?


If you have your own recommendation regarding paint, by all means spill the beans.


Thank you!


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I own a large marine store here in NJ. I sell a lot of paint from Interlux, Pettit, Aquagard, and some others. I have never heard of this product and based off the looks of their website(not professionally done) I wouldn't buy anything from them. Plus the amount of copper they are using seems high, but with the better multiseason paints you can releases a lower % that will protect the boat without leaching all the extra contaminants into the water. Paints with high copper like that will peak and decrease over time. Better paints release it over a longer period of time.


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In general, most antifouling bottom paint of the same type (ablative, single season, etc) is compatable with each other, without sanding.   



  However, different types of paint have different hardness's.  You want to match the hardness between paints.


For example, most ablative and modified epoxy single season paints are about the same hardness.  You should get the loose paint and dirt off, before repainting.  So, if you want to put ablative paint over single season paint, and the single season is about the same hardness (modified epoxy formula), that will work.


Putting a modified epoxy paint over a soft bottom paint reduces it's hardness to the level of the soft paint.   Also, there are some paints that have strong solvents that will lift the current paint off the hull, when applied.  Read the label to avoid this situation.


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In general, most antifouling bottom paint of the same type (ablative, single season, etc) is compatable with each other, without sanding.   

  However, different types of paint have different hardness's.  You want to match the hardness between paints.

 

For example, most ablative and modified epoxy single season paints are about the same hardness.  You should get the loose paint and dirt off, before repainting.  So, if you want to put ablative paint over single season paint, and the single season is about the same hardness (modified epoxy formula), that will work.

 

Putting a modified epoxy paint over a soft bottom paint reduces it's hardness to the level of the soft paint.   Also, there are some paints that have strong solvents that will lift the current paint off the hull, when applied.  Read the label to avoid this situation.

 

Speaking of strong solvents....

When I spoke with the Pettit reps at the AC boat show a few years ago, going to water based product

has the advantage of not using the strong solvents, which in some old paint situations could compromise the bond of that older paint to the gel coat. And how water based products are easier and environmentally safer to work with. Got 3 seasons from Pettit hydro coat, it's time for bottom paint this spring. and I'm definitly going with hydro coat again, except this time the enhanced SR type. In the past I have tried aguagard, and found its bonding qualities and durability inferior to Pettit. Come on spring....

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