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View Full Version : Another Roof Coating Thread - What are You using and How Has it Held Up



thompsdw
10-08-2014, 07:44 AM
I've noticed that the number of roof coating threads here is not as strong as I would expect based on how often it seems to need done. I thought I would try again to get one going to help me and others decide what to install as a DIY solution

So, I was leaning toward Durabak, but after noting that the coverage is only 60 ft2 per gallon - I think I am leaning another direction. That would be a cost of about $700 for my boat roof. Just seems excessive to me. I can do the gelcoat solution, but that is a more "techniquish" answer for a DIY person.

At this point I am leaning toward Interlux Britghtside. A one part polyurethane paint with very good coverage. Any thoughts or other less expensive alternatives I should consider?

OLD HOUSEBOATER
10-08-2014, 10:51 AM
Adding a polymer anti slip additive such as Interlux or Sharkebite to any deck enamal gives a durable , foot friendly, coating that is easy to clean. Also a big plus is recoating is not a problem.

Sharkbite is available at Ace Hardware.

thompsdw
10-08-2014, 10:56 AM
Found it on Amazon. Seems easy on the foot based on the description. Great tip, thanks!

easttnboater
10-08-2014, 12:59 PM
Gel coat is not that hard. The prep for gel coat should be the same as any coating. The big deal with gel coat is to know the real temperature and humidity so that you can measure out the hardener correctly.

If I wanted a never have to do it again solution, then I would get the roof professionally bedliner coated.

thompsdw
10-08-2014, 01:25 PM
If I wanted a never have to do it again solution, then I would get the roof professionally bedliner coated.

LOL, that would cost more than my houseboat is worth ................

Stmbtwle
10-08-2014, 01:49 PM
LOL, that would cost more than my houseboat is worth ................

Mine, too!

I used to use "Kool Seal" which works well but is hard to keep clean. A couple years ago after washing the roof I painted it with high-gloss latex paint. That works well, reflects the heat and is easy to keep clean. Water-based paint has come a long way.

easttnboater
10-09-2014, 06:18 AM
It is pricey, but it will last forever.

thompsdw
10-20-2014, 11:08 AM
Just wanted to post a followup. I did use Interlux Brightside white polyurethane paint on my my houseboat roof painting project. Here is what I found so far:

- The coverage is amazing. In two ways - you couldn't see the original coating with one coat of the paint, and one gallon put 2 coats on my 43' houseboat roof. I was very pleased with this.

- As advertised - it is a gloss paint, so it is slippery. I am going to use shark skin in the final color.

- White is too white for a roof. After two coats we've decided to add a third coat of off white to tone it down.

- The paint is a very hard surface. This is what I wanted.

All in all, I am very pleased with the coating. I think it is a quality coating that goes a long way. If I hadn't picked the wrong color - this would have been a $120 project.

Stmbtwle
10-20-2014, 03:29 PM
Brightside is a good, tough paint; I used it on all my earlier boats. I'm sure you'll be happy with it.

I guess whether to use white or off-white is whether you have a fly bridge. I don't and my objective is keeping things cool; if I could put a big mirror up there I would!

OLD HOUSEBOATER
10-20-2014, 05:37 PM
Get Sharkbait at ACE HARDWARE

stp012
10-26-2014, 06:38 PM
Just wanted to post a followup. I did use Interlux Brightside white polyurethane paint on my my houseboat roof painting project. Here is what I found so far:

- The coverage is amazing. In two ways - you couldn't see the original coating with one coat of the paint, and one gallon put 2 coats on my 43' houseboat roof. I was very pleased with this.

- As advertised - it is a gloss paint, so it is slippery. I am going to use shark skin in the final color.

- White is too white for a roof. After two coats we've decided to add a third coat of off white to tone it down.

- The paint is a very hard surface. This is what I wanted.

All in all, I am very pleased with the coating. I think it is a quality coating that goes a long way. If I hadn't picked the wrong color - this would have been a $120 project.

What did you do for prep? Did you sand the entire surface? Did you sand between coats?

I need to re-paint one of my roof decks. The previous owner used Interlux Brightside which is probably what I'll end up using.

Funny, I was just thinking today about bed liner. I'm going to call around to see what it would cost.

easttnboater
10-27-2014, 06:52 AM
It is not cheap. You have to find the right person with the portable unit. Prepping the top is not that bad, but you have to cover the rest of the boat. Any overspray will pretty much stick to anything.

thompsdw
10-28-2014, 07:40 PM
What did you do for prep? Did you sand the entire surface? Did you sand between coats?

I need to re-paint one of my roof decks. The previous owner used Interlux Brightside which is probably what I'll end up using.

Funny, I was just thinking today about bed liner. I'm going to call around to see what it would cost.

Prep for the old coating was sand with 80 grit sandpaper and then a wipe with denatured alcohol. I talked to a technician at interlux and they said that if you recoat just after the recoat time, that you didn't need to sand again, but the alcohol wipe is still a good idea. If you wait much longer than that, then repeat the 80 grit and alcohol wipe.

Tclark
02-09-2015, 07:18 PM
I have a 1990 Myacht, not sure what the roof is made of but it is leaking, any suggestions on what to use to seal it?

desimulacra
03-26-2015, 01:51 PM
Has anyone any experience with Quick Rook Extreme? It is a EPDM RV product. I see where as with all EPDM's it is prone to caulking.

Frantically Relaxing
04-09-2015, 06:15 PM
I'm getting ready to redo the roof of our Skipperliner. The original roof is (best I can tell) a 3-section gelcoated plywood cap, each 12x16' section consisting of 6 sheets of plywood. The gelcoat has 'failed' in a few spots over the years.

My problem is, the roof has had indoor/outdoor carpeting fully glued down to it no less than 3 times. The buildup of carpet glue is such that it will be next to impossible to ever remove it all. Best I've been able to do with it so far is to sand the old glue down relatively smooth, and fill in any voids with a little glass 'n resin. I'm only about 10% done, and the next few weekends will be dedicated to getting the other 90% done...

What I'll be left with won't be suitable for paint or gelcoat. However, I figure it should be just fine for the likes of 2-part roll-on EPDM rubber, Durabak or something akin to Rhino lining. I mean, it's not like these coatings have to adhere to the roof very much, the finished product will essentially be a fairly heavy one-piece topping that gravity will hold down. For the past 5 years the back 10' of our roof has been covered with a 10x12' sheet of black EPDM rubber, glued down only along the edges with construction glue. The rubber itself and the glued edges haven't changed or deteriorated a bit. We've been toying with the idea of just covering the whole roof with a one-piece sheet of EPDM (about $550) then covering THAT with THIS:

http://www.engraver1.com/erase2/IKEAwood.jpg

It would be REAL easy to do, much easier than any other method. The old carpet glue finish wouldn't matter a bit to a sheet of EPDM. And I would never have to worry about the roof ever leaking again. The Ikea patio wood is pretty reasonable in price too. Would be no problem covering it up for winter either.

BUT, I'm still considering a Rhino/Durabak type coating too. I'm just not all that familiar with the costs and all with those. Especially the labor involved.

We're only weekend users at the moment, at least until I can semi-retire in a few years, but we use the roof a LOT, we're always having BBQ's and other get-togethers up there....

http://www.engraver1.com/erase2/roof1.JPG
http://www.engraver1.com/erase2/roof2.JPG
http://www.engraver1.com/erase2/roof3.JPG


We've had carpet up top for the 9 years we've owned her, not sure we'd like a bare rubbery floor. But not sure we wouldn't. The wood patio floor would definitely be cool!

Any suggestions or advice?

easttnboater
04-13-2015, 07:42 AM
I used Dridek over a rubberized roof. It worked well, but was a PITA to clean. How hot does the wood patio product get in the sun?

Frantically Relaxing
04-13-2015, 12:32 PM
Even carpet that's been in the sun can be too hot to walk on in bare feet, so how hot the wood gets isn't much of a concern. Most of my roof is covered too.

As for EPDM chalking, not sure but I believe that only applies to WHITE. I'm just using basic black. Our Party Cruiser had a white EPDM roof that chalked & shrunk badly in 10 years of exposure. I replaced it with black back in 2006, and like what I put on the Skip, it looks like the day I installed it. I've heard the black is good for 45 years. Does the black absorb heat more than the white? I suppose, but geez, I can't believe a sheet of white rubber exposed to direct sun in 100 heat is going to be very much cooler than a sheet of black. I haven't noticed anything detrimental from using it. Keeps water out, that's all I ask!