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Author Topic:   Single-part Polyurethane Paint
jclays posted 04-17-2007 11:24 PM ET (US)   Profile for jclays   Send Email to jclays  
[Seeks experienced users of] single-part polyurethane paint such as Interlux [P]erfection [Note--later mentioned that Interlux Perfection is not a single-part polyurethane paint]. I bought an old boat that was painted years ago and is showing it. Can't tell what is on it but it is chalky. I have read that it is not possible to put two-part polyurethane paint on anything other than two-part polyurethane paint.
Binkie posted 04-18-2007 07:26 AM ET (US)     Profile for Binkie  Send Email to Binkie     
That's a good [implied or indirect] question, but I`m not sure [the statement] is true. The primer that you use for Awlgrip, 545 Epoxy primer, is an epoxy as the label states and will stick to about anything. Just to make sure, you can, make a call [to Interlux]. Of course you`ll have to sand off the chalkiness and sand any loose or flaking paint off. too. Prep work is the key to a good paint job. One part paint is not satisfactory as you can see, and must be repainted every couple of years.


John from Madison CT posted 04-18-2007 08:46 AM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
Interlux Perfection is a two-part paint, not single part.
jclays posted 04-18-2007 10:19 AM ET (US)     Profile for jclays  Send Email to jclays     
Ok. Not [P]erfection but [I]nterlux one-part polyurethane paint. [P]erfection is the two-part. Can [I] prime over the existing paint after prep and sanding[?] [I] will not be taking it all off. Use [I]nterlux primer then two-part?
andygere posted 04-18-2007 11:24 AM ET (US)     Profile for andygere  Send Email to andygere     
I used Interlux Brightsides to paint a sea kayak that I built, and used the foam roller with foam brush tip out method. If you do it right, the results are amazing. Prep is the key, and I spent countless hours sanding and fairing to get this result:

megawhaler posted 04-19-2007 12:37 AM ET (US)     Profile for megawhaler  Send Email to megawhaler     
I'd realy like to help you out, as I've worked with Interlux one- and two-part a bunch of times. However, I'm having trouble understanding what your asking. I'm not trying to be sarcastic, but I can't decide if your asking a question or making statements with your punctuation. I'll give it a try though.

Interlux makes a special two-part primer that you can top coat with a one-part AND two-part paint. They also make another primer that's only for use with the one- part poly paint. The two-part primer can be put over anything, that is, your boat. Just sand it good and fair it with putty if need be.
Then use either top coat.

Note: the two-part can be a pain to work with but lasts longer. The one-part is a no-brainer to use and quite a bit cheaper. Both end results are initially identical to look at. If you're doing the boat inside and out, I suggest you start with the outside to get a feel for the paint. It's a lot easier to re-sand if you mess it up.

Good luck

PeteB88 posted 04-19-2007 12:39 AM ET (US)     Profile for PeteB88  Send Email to PeteB88     
Don't scrimp, pay the money, buy marine grade, time proven, trust your Whaler brothers, they won't steer you wrong. Or ,if you decide to experiment, keep us posted. Remember when bright finish, whatever you choose to use, loses 50% of original gloss, simply scuff sand, remove dust and slap on a couple of coats. You're good to go for another 3, 5, 7 depending on environment, usage and care.
jimh posted 04-19-2007 04:47 AM ET (US)     Profile for jimh  Send Email to jimh     
Interlux appears to have quite a comprehensive website covering their products, and I bet you can find out about their paints from them directly. See

Note: I would have given a more direct pointer to the information available on polyurethane paints but the design of the Interlux website uses frames. Frames are a horrible invention for presentation of information in HTML and they prevent direct linking to the information contained in the various frames. While the frame content changes, the URI for the page remains static.

jimh posted 04-19-2007 04:48 AM ET (US)     Profile for jimh  Send Email to jimh     
Andy--great looking finish on the kayak!
Whale1 posted 04-19-2007 09:03 AM ET (US)     Profile for Whale1    
Any experience or comments on Petit EasyPoxy?
PeteB88 posted 04-19-2007 10:09 AM ET (US)     Profile for PeteB88  Send Email to PeteB88     
I have used Petit Easypoxy for years mostly on wood boats over epoxy/glass cloth with great results. Did an aluminum boat (vintage Grumman Combo II - rare I am selling) three or more years ago and it is great. Saw a boat yard mechanic painting an older Hobie 16 at Laughing Gull Marina a couple of years w/ Easypoxy and foam brushes - it really brushes on great, good longevity and not too spendy. In fact, for boats it's my first choice but I have not used Awl Grip or the two part stuff and really do not have the experience w/ paint as much as I do with bright finish.

Binkie posted 04-19-2007 01:58 PM ET (US)     Profile for Binkie  Send Email to Binkie     
Pete, Easypoxy will start to loose its gloss after a year, and will look bad in 2 years in the Florida sun. I painted my daughter`s sailboat with it and that is the experience I had.
PeteB88 posted 04-19-2007 11:48 PM ET (US)     Profile for PeteB88  Send Email to PeteB88     
I won't use it in FL - thanks!! no doubt you are correct.

Whale1 posted 04-20-2007 01:59 PM ET (US)     Profile for Whale1    

Thanks for the info, Since I am also in Florida, it's especially valuable advice.

John W posted 04-20-2007 08:47 PM ET (US)     Profile for John W  Send Email to John W     
Petit Easypoxy and other one-part polyurethane paints are very good paints, compared to other one-part finishes. They are easy to use and give nice looking results, but if you use the boat hard and/or leave it in the sun, it will need to be redone every 2-4 years. But compared to the traditional marine paints used for annual hull painting on wooden boats, Easypoxy is a very good paint. If you want to get an old boat looking good again with a minimum of work, and you don't mind repainting the floor in a few years if it starts to peel, the one part paints may be the perfect answer.

The two part polyurethanes, on the other hand, are much harder, more durable, more abraision resistant, shinier and glossier than any one part paint. They also require MUCH more prep work, they are harder to work with, and they give off dangerous fumes that will require a good filtered mask. They are also expensive. But they will keep their shine for 10 years in the sun, and indefinitely if the boat is stored under cover when not in use.

So which to use is a factor of how much work you want to put into it, and how long you expect the finish to last before repainting or refinishing.

I chose to use a two part polyurethane on mine. I prepped my boat, then had it professionally sprayed with 2 part polyurethane in 2005. The paint job still looks brand new.

Hope this helps.


jclays posted 04-20-2007 10:04 PM ET (US)     Profile for jclays  Send Email to jclays     
Thanks Mega Whaler and everyone else who have responded. I recieved an email from the Tech folks at Interlux. They say not to put their 2 part over anything other than 2 part even with primer. They recomend total paint removal if its not 2 part poly paint. It looks like maybe the Brightside one part poly is for me. Does one part poly last longer than marine enamal or other marine paints aside form 2 part poly. I hear Brightside poly is actually pretty good.
andygere posted 04-22-2007 04:53 PM ET (US)     Profile for andygere  Send Email to andygere     
The Brightsides I put on my kayak still looks great after seven or eight years, but the kayak has always been stored in an enclosed shed. If you can keep the boat covered, any finish you choose will last much longer.

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