[PSUBS-MAILIST] Hull Painting

[Jon Wallace via Personal_Submersibles]

 What about coverage?  Did you require a gallon?  Two gallons?


    On Monday, June 24, 2019, 03:06:52 PM EDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi Jon,
I've always used "mill white" Macropoxy 646. I like that it goes straight onto bare metal and has really good coverage. Its thick, appropriate for application with a roller. This makes it really easy to patch. I haven't measured the work or cure times, but they're generous - I'd say when you mix it up, you probably have at least an hour to apply, so it's never been an issue because I mix a bit at a time. It dries to the touch in probably 4-8 hours. 
Negatives include yellowing in sunlight and susceptibility to scratching. With Snoopy, I just spray painted the CT dayglo orange over the Macropoxy, but the sun would turn it a brick-like color pretty quick. On Shackleton, the CT was painted in Macropoxy as well but then top-coated in a less bright orange by the guy who did the sandblasting. Although it's not as bright as the dayglo was, I've noticed this top-coat has not dulled at all and is MUCH less susceptible to scratching. It has made me think that in the future, the ideal would be to paint the sub in Macropoxy and then top-coat in something harder. Unfortunately, I don't know exactly what paint I have on that CT. 
Best,
Alec
On Mon, Jun 24, 2019 at 2:26 PM Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alec Smyth...can you give us some more details on your experience with Sherwin Williams paint and your hull painting experience.
1) Do you recall which Macropoxy product you used?  There are multiple types listed on their web site.2) How much "working time" did you have with the product?3) How long before it dried to touch?  Cured?
It looks like white and black colors are the only ones they list as acceptable for "immersion" in salt water.  I can't help but wonder what the difference is between the same product in yellow or red options.
I haven't decided what I'm going to do yet since I may be limited to hand painting the 600 in my yard, uncovered.  The place I am having sandblast the sub does not paint so I either have to find some other place or do it myself.  One thing, I don't care about the finish.  I actually prefer Alec's method of hand rolling with "orange-peel" results simply because repairs of scratches and dings would blend better (I think).
Anyway....rambling here and looking for thoughts from the group.
Jon
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