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Author Topic:   Bottom painting a 15
Ron Brassord posted 03-12-2002 08:17 AM ET (US)   Profile for Ron Brassord   Send Email to Ron Brassord  
I recently acquired a 85 15 whaler and want to paint the bottom with anti-fowling. The boat has never been wet stored and has no scum line or any indication where the waterline falls. I know it's tricky to get it right especially around the bow, But I did it fine on a 13 using a level surface for measuring. To get the 15 right, it would seem i would need a measured distance up from the bottom on the transom, and down from the rubrail on the bow? Anyone one have these measurements or any ideas ?
Ron Brassord lighthouse Pt Fl
Blackeagle posted 03-12-2002 12:48 PM ET (US)     Profile for Blackeagle  Send Email to Blackeagle     
Does "anti-fowling" paint keep ducks and other waterfowl from accumulating on the hull? :-)

Seriously, I don't know that either the keel or the rubrail will necessarily be parallel to the waterline. Looking in cetacea I see a lot of whalers (usually ones with big engines and/or jackplates) that definitely don't sit level in the water. I think your best bet is probably to put the boat in the water and measure/mark the waterline.

TightPenny posted 03-12-2002 04:44 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
That is the best way. Just put it in and use a grease pencil or crayon to mark the lines. Take it out and dry it off and mask the lines and paint it. Give yourself about an inch above the marks to allow for scum buildup due to wave action.
PMUCCIOLO posted 03-13-2002 02:48 AM ET (US)     Profile for PMUCCIOLO    
I have the owner's manual for the 13, 15, 17 foot classic models. It has the measurements and schematics for bottom painting. I'd recommend reviewing the thread on dry storage vs. wet storage of the 21 Ventura vs. Outrage on the Post Classics section. I suggest contacting the paint manufacturers directly...they are most helpful.

I don't have a scanner, but I can photocopy and mail the specs to you if you wish.


Ron Brassord posted 03-13-2002 07:48 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
I would very much like to get factory specs on measurements for applying anti-FOULING paint. Dunking the boat to get a scum line is not a good idea since our waters are so pristine here in Florida,yeah sure.
What works for me is to establish a waterline height bow and stern, and then level the boat on a smooth surface to the two marks. Then a measured stick will allow tick marks to be made all around the boat for a perfect waterline. This works well on a complex whaler bottom.
Yes, the paint will keep ducks etc off if they happen to fly underwater.
Back in the 70's we bought a 13 whaler for our 13 year old son. Then we were whalerless for many years, and now we have bought a whaler for the grand kids visits. I don't know which has been more fun, but a boy and a whaler sure mix well.
Ron Brassord LHP FL
Alan Hiccock posted 03-13-2002 09:49 AM ET (US)     Profile for Alan Hiccock  Send Email to Alan Hiccock     
I recently bought a 15 that had bottom paint, I recoated it couple weeks ago , retaped it of course. The bottom paint is taped off so uniquly because the hull is so unique. It angles on the gunnel then it zips back into the sponson then cuts up onto the hull. Its cool because SO MUCH of this hull's bow and big chines or sponson's are left uncoated.
Never had a boat that looked better with bottom paint, it takes hardly any paint also, depending on it you thin it a qt. or less , most likely less. Do 2 light coats if never BPed before.
jameso posted 03-13-2002 09:05 PM ET (US)     Profile for jameso  Send Email to jameso     
My 15 sport has the following paint line.
Measure 3" from BOTTOM of sponsons at transom. Mark both sides and tape this across the transom, then stretch a 65 inch string from the 3" mark FORWARD to the intersection of the leading edge of sponson, make a mark there, then for reference make another mark 8" BELOW the lower edge of the bow eye. This will give you about 3/4 inch or less of paint above the water line with a lightly loaded empty (moored) boat.
Hope this helps and is not too cornfusing.
Jim Armstrong

Tom W Clark posted 03-13-2002 09:24 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

The ONLY way you are going to get a truly satisfactory waterline on your boat is to mark the line based on it's own unique loading. To this end you need to either launch it and mark it (easier said than done, but possible) or launch it and mark the transom and mark the stem.

If you can get marks on the transom and stem you can then move the marks up to wherever you decide to terminate the bottom paint. I would say at least 1" and perhaps as much as 3" depending on how much wave action your mooring gets. (I prefer to keep it minimal at about 1" and just do an occasional scrubbing of any scum)

Then use a laser level to connect the dots. You can rent a laser level if you don't have access to one and it will make the job much easier as well as precise. Nothing looks a lousy as bottom paint the "creeps" up under the bow. I've seen way to many of those.

An alternative to the above is to use the transom mark and stem mark and then level the boat on a VERY flat slab. Use a story pole (stick or dowel) with the height marked on it. Walk all the way around the hull and mark off the hull every few inches.

PMUCCIOLO posted 03-14-2002 12:24 AM ET (US)     Profile for PMUCCIOLO    
Don't call the EPA (or whoever the regulatory agencies are), BUT, to mark the waterline on my old 26' Grady White, the following procedure was followed:

The boat was loaded with fuel, water, oil, and all of the equipment that would regularly be on it when in its berth.

A can of spray paint was used to spray around the entire hull, leaving a remarkably distinct line.

Tape off the hull one or so inches above that, and begin to sand, barrier coat, and paint.

The waterline was PERFECT!

I know, I know, I'm going to get assaulted for spraying paint onto the boat's waterline when it was in the water...

I hope that this helps!

PMUCCIOLO posted 03-14-2002 12:27 AM ET (US)     Profile for PMUCCIOLO    
I just remembered, the post under which I commented on bottom paint procedure was "Newbie's questions" on the Post-Classics section.


Ron Brassord posted 03-14-2002 08:06 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
To Jim Armstrong
I think you have provided exactly what I need to bottom paint. My boat is setting on a trailer on a smooth[not level ] floor in my garage. I will use your measurements to get the bow and stern marked. Then by adjusting these marks so that they are exactly the same height, any point in between will be on a correct plain.
To be sure of the heights, the stern is three inches ABOVE a line between sponsons? This would bring it just about at the drain plug for the engine well? The bow is eight inches measured down from the bottom of the bow eye? The 65 inches measured on the side would provide a line about paralell with the sheer?
Looks good to me, and thank you
Ron Brassord
Ron Brassord posted 03-20-2002 07:59 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
I got the second coat of bottom paint on and the waterline came out perfect using the measure up from the floor method. I adjusted the boat on the trailer so that three points bow and stern were exactly the same. The three points were 9 inches below the bow eye, and three inches above the sponsons on each side. The distance to the floor was 28 inches. I cut a stick to 28 inches and used this as a guide to make tick marks all around. Some marks were off a bit, but in taping, it was easy to fair the line to most marks. Then an eyeball check showed a clean sweep of the line from any view. How much better could it be?
Time to launch Ron B
jameso posted 03-20-2002 08:41 AM ET (US)     Profile for jameso  Send Email to jameso     
Ron, am curious as to how accurate the "waterline" measurements that I gave are. Have you had the boat in the water yet? Keep us posted.
Jim Armstrong
Ron Brassord posted 03-20-2002 05:21 PM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
Well Jim I got a little egg on my face. The water line is absolutely perfect when you eyeball it. However, I launched it, and I need about another inch or maybe two inches in the stern to show bottom paint all around. My line is OK and my method works, but I didnt allow enough for the weight in the back.
A fix will be easy. The next time I haul, I will just run masking tape at the correct height using the established line as a guide and paint it in right. We used to do this all the time with old wood boats that soaked up a lot of water weight and we just kept raising the boot stripe up an inch or so every few years.
Our first ride was awesome as the kids would say. There is just no comparison between this 15 and the old 13.
Keep boating Ron B
jameso posted 03-20-2002 08:40 PM ET (US)     Profile for jameso  Send Email to jameso     
I don't know if I need to apologize or not, sounds like you got it about as good as you can get on the first go around. My 15 is lighter in the stern than yours, my 50 weighs 188 or so you have a 70 and I only have 9 gallons of fuel and a small battery. But it is good to know the measurements that I gave could be used as a norm.
Think we need to make a 15 fan club somewhere.
Jim Armstrong
Ron Brassord posted 03-22-2002 07:44 AM ET (US)     Profile for Ron Brassord  Send Email to Ron Brassord     
Jim We have had a chance to put some miles on our new[old 85] 15, and we are in love with the boat. It has a soft ride which we never expected, especially after owning 13s. We also are pleased with the used 70 Johnson, after owning several Yamahas, and wonder why the company failed. Sad.
I do believe we are a fan club?
Ron B

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