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Author Topic:   Linear Polyurethane
sma posted 01-11-2002 07:32 PM ET (US)   Profile for sma   Send Email to sma  
I would like to recoat the hull and deck of my 16' whaler. I have seen a lot of discussion about wether to paint or not to paint. I would respray the boat with gel coat but I have heard that Linear Polyurethane has better water proofing qualitites and is easier to apply. Has any one ever heard of this product. I understand that it was originaly for the auto repair industry.
OutrageMan posted 01-11-2002 09:29 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Isn't Interlux Brightsides a linear poly?

Brian

sma posted 01-15-2002 09:33 PM ET (US)     Profile for sma  Send Email to sma     
I am not sure of the brand names. I am mostly wondering if it is a comprabale water proofer to a gel coat. I am told that it is better and easier to use. Any info on wear to look would be nice. Anything
OutrageMan posted 01-16-2002 12:37 AM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Check out Interlux's website. They also make a great free booklet available at West Marine, Boat US, etc.
Paint Legend posted 01-19-2002 08:24 AM ET (US)     Profile for Paint Legend  Send Email to Paint Legend     
LP's are not waterproof paints, in fact they will peel and blister when submersed in water for extended periods of time. Gelcoat is better as far as waterproof (resistant) but will absorb water and blister (osmosis) over time.

I know the purists prefer to re-gelcoat, but it is labor intensive/expensive due to wet sanding and buffing required to get a glossy orange peel free finish. Gelcoat also requires more upkeep, buffing and waxing but it is dependant on your usage and locaation.

If you paint with a poylurethane or acrylic urethane your material cost will be more but maintenance will only require washing. There are a ton of previous posts debating gelcoats and paints. Check them out and do what makes the most sense to you.

Regards,
Tom

ps - Brightsides is an enamel, good for wood boats.

sma posted 01-19-2002 09:49 PM ET (US)     Profile for sma  Send Email to sma     
Thanks Tom!
vinay posted 12-30-2006 10:44 PM ET (US)     Profile for vinay  Send Email to vinay     
I would definitively not re gel coat. It is hard and requires very special spray equipment (and controlled environment),
It would help to know what type of boat you are talking about. I just refinished my canoe. I sanded the whole gel coat off because it had too much crazing (small small cracks in the gelcoat). Sanding did not alter the shape in my case, however. From there I gave it two coats of fiber glass primer (epoxy two parts) and finished with real polyurathane, also two coats. The boat finish will last for the rest of its life. The polyurathane was Pacific Endura. Expensive but one of the best. My sail boat is finish with three coats of Interthane from Interlux. Its been 20 years and still shiny!
BTW , many paint dealers (marine) will have miss-tint! I got my Pacific Endura at a third of the price because the original customer did not like the red that has been mixed for them. Me, I love it...
vinay posted 12-30-2006 10:55 PM ET (US)     Profile for vinay  Send Email to vinay     
quote from forum:
"If you paint with a poylurethane or acrylic urethane your material cost will be more but maintenance will only require washing. There are a ton of previous posts debating gelcoats and paints. Check them out and do what makes the most sense to you."

One has to be careful in understanding 'Paint". (it is my business!)
There is paint (many kind). There is Polyurathanes and there is Epoxies.

If you are given a paint that is 'acrylic urethane' you have really nothing as far as the marine environment is concern. It is just paint. A good one, yes but only paint ... not at all a urathane or polyurathane. Those paints (epoxies and urathanes) are very very good but very very expensive. So manifacturer of paint (regular) add the word epoxy or urathane to trick the customer into buying it. An acrylic urathane has NO polyurathane in it and if it did, the urathane would prevent the paint from drying and hardening.

That is not to say that real expoxies and real urethanes can not have substrates of different value, in them! For example epoxy with metal grounds is an excellent filler and can be sanded and machine and is very strong. Then it is no longer a "paint" but a "putty",
One can have 'Tar' components in a urathane to make it stronger against attacks by solvents. (ex Industrial tanks!)

Acrylic urethane, I would only use inside the boat. Then it is smooth, shiny and simply lovely. Very stong too. Topside of wooden boat is another application.

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