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Two questions regarding the Interlux Pre-Kote primer that I’ve learned about today (a few days before we apply it to #150). It’s apparently full of moisture-absorbing filler.
1. Don’t apply in humid weather at risk of causing adhesion failure of the subsequent coat of paint. How critical is this? Cenral Maryland is mostly quite humid at this time of year.
2. Don’t apply below the waterline. Does the exception for boats that only go in the water when they’re in use–like the Cocktail Class Racers–apply to this primer as well? Or is it a really bad idea to put it below the waterline at all.
I would highly recommend following the manufacturer’s specs on your specific application. The forums and product ratings have lots of questions and answers about these issues, but it would be much safer to go to the manufacturer or distributors for the answers. This is something you don’t want to get wrong. Interlux Pre-Kote does specifically say not to use it below the waterline, so maybe it would be best to get their interpretation of use below the waterline. I saw a different product recommendation that said even overnight in the water is not recommended, but that was not Interlux.
Interlux is a popular product with some major distributors offering support, so I would make a call to a support technician to get an interpretation from Interlux for our specific application. And let us know what you find out.
Rick
I do not know if you have seen this yet but check it out.
https://www.clcboats.com/shoptips/boat-paint-varnish-finishing/painting_polyurethanes.html
Cameron
I contacted CLC for confirmation on ” If your boat is going to live in the water for days or weeks, you should consider using either a two-part linear polyurethane paint or an herbicidal bottom paint. Don’t use primer beneath Brightsides in areas that are fully immersed.” which is in their write up on the Brightsides paint. I asked them if this means do not use period or only if boat will be in the water for a longer period of time. I will give you the answer when thy reply.
Cameron
The photo in the second CLC link referenced above clearly shows a boat with a full coat of gray primer on the sides being painted red; the bottom is not visible.
We bought the Interlux primer and paint in person at CLC. It’s what they told us to use. After we bought it, I started researching what we might need to know about it before applying it.
I consulted with a friend, whom I helped build a CLC Mill Creek kayak kit some years ago. He used two coats of the Interlux primer on the entire hull before painting, sanding between coats. The boat lives mostly out of the water and he’s not had any issues with the finish; it’s still beautiful.
It would be interesting to hear from anyone who has had an actual negative experience from doing this with a boat that is usually out of the water.
In any case, we applied the primer to the entire hull yesterday in the heat and humidity and will be sanding off much of it in the next work session. We’ll paint after that, no second coat of primer. If this eventually turns out badly, I’ll certainly report that in this forum, but it will take a year or two to find out.
Marty, if my recollection is correct, Interlux Brightsides is actually a deck paint and is not intended to be used on the hull. Several CLC builders, myself included, have discovered that the paint will blister if left exposed to moisture for too long. If the bunks on my trailer get wet I have to lift my boat and put a piece of non-absorbent material between the boat hull and the bunk to avoid blistering.
Hey folks, I’m new here, experienced sail/paddle builder, first time with power!
Brightsides is my go-to finish for the trade-off between cost, ease of use, and quality of finish. My first boat is a Shellback dinghy that was intended to be dry sailed, but has spent several days at a time on a mooring. I used pre-kote throughout (interior and exterior both above and below w/l).
Interestingly, the exterior has held up very well, even below the waterline (except for the dings and scratches). The finish has peeled pretty significant off the brass keel strip.
However, the interior peeled pretty significantly all the way to the primer on the floor where a little rainwater was allowed to stand for a couple of days. I expect that was the primer absorbing water and interfering with adhesion of the finish coat.
So I thought I would reply even though the thread is old. Keep it dry after use if you want your Brightsides-over-Pre-Kote to stay nice!
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