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I have put down three coats of the supermarine 664-D etching primer and am doing the final sanding with 180 before the SM1000 is applied. I have sanded thru the primer down to the epoxy in a number of places. Most are not much larger than the size of a quarter, but am wondering if it's necessary to reprime these spots, before putting down the paint.

Just guessing, but I think I would re-prime in those spots.....easier to fix now at this point than later

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Get the boat ready for another coat of 664D and right before you apply be sure to use a tack cloth to clean the surface, you can then apply a final thin coat of the 664D and then immediately when that is tack free, (should take less than an hour) apply your first coat of color (thinned 8%) and your primer and first color coat will chemically bond as they fully cure.

On the subsequent color coats (after curing 48 hours) you will need to lightly scuff the surface with a fine sand paper (I used 320) to prevent crinkling and acheive a good bond.


When I did my Supermarine primer and paint I achieved the above by starting from just the bare epoxy coated fiberglass hull, sanded smooth and did 2 coats of primer and the first coat of color all within an hour or so of each other. With that method in one morning your boat goes from bare to primer to color. --Thanks to Dave L who educated me in this method.
Be sure to scuff and clean before subsequent color coats and use a tach cloth, it makes a big difference in dust and oil on the surface. 3 color coats total should be enough.

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"Nothing screams poor craftsmanship like wrinkles in your duct tape."

The problem I have with putting another coat on is that it seems I get either orange peal or texture from the roller on the boat. Not ever having used this paint or built a boat before, I'm not sure what it is. I have put the primer on with the top of the line 1/4" nap roller and put it on as thin as I could, and it seems to flow out well, but when I go to sand it, I see a texture in the paint and it requires a fair amount of sanding to get it smooth. Some of the texture I'm not even sure you can feel, but looks visible. I don't think I have enough primer to do the whole boat, so I think my only option is to spot prime the bare spots and I'm afraid that may not work out well. I don't know if the paint will fill in any minor texture issues with 3 or more coats.
I'm open to suggestions

Is there any way for you to post some pics of the primer? then maybe someone can tell if you are getting alot of orange p. or if its just the texture from the roller.

Too late. I prety much got it all sanded out. I also think it really would be hard to get a photo of it. You have to have the light hit it just right to see it well.

The paint is a lot thicker than the primer and cures very slowly, it should flow out fine. It sounds like what you are dealing with is pretty minor and that it is smooth now, so it sounds like you are good to go in that regard.

Im not sure if you would run into any problems going ahead and painting at this point. You dont want to ruin the job by being too impatient to wait for more primer to be shipped to you either.

I would call Supermarine, there tech guy was very helpful for me, explain your situation and see what they have to say.

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"Nothing screams poor craftsmanship like wrinkles in your duct tape."

The manufacturer said I can paint as is. I have put down two coats so far and it just takes a more coats to cover the places that the primer was sanded thru. The sheen is the same.