Bottom Painting while on trailer

Red Raven

Coupeville, Wa
Joined
May 14, 2015
Messages
1,807
Location
Whidbey Island, Wa
Fluid Motion Model
R-27 Classic
Hull Identification Number
FMLT2734C414
Vessel Name
Red Raven
MMSI Number
338190767
After four six month seasons on the water the bottom paint on our 2014 R27 was getting pretty tired. We built a custom garage for the boat with thought that we could recoup some of the cost by saving on annual maintenance costs, moorage fees, and minimizing the wear and tear from the weather. Painting the bottom while in the garage was the one challenge I had yet to tackle until now.

First, how to lift the boat from the trailer to paint under the bunks? I chose to use a couple of (12ton!) hydraulic bottle jacks to do the heavy lifting under the keel. I made a couple of cradles for the keel out of wood and 1/4” plate steel to protect the keel from the jack pistons. I also spread the load by placing the bottle jacks on some scrap 12 ply plywood used for building concrete foundation forms. I didn’t want to crack the concrete floor! In addition, I used the trailer boat lift system from Brownell Boat Stands (about $650) to stabilize the boat. Technically the trailer boat lift system can lift the boat without the bottle jacks but since they were near their rated capacity (10000 lbs) I chose a belt and suspenders approach.

Here is a couple of photos with the boat up on the boat stands and jacks.





Next to prepare the bottom. I was painting over existing factory applied Seahawk AF33 with the same product. The labeling specified a clean and dry surface with no mention of sanding. I chose to use a 50/50 mix of vinegar and water, a stiff scrub brush and a towel rinsed in clean water. Since I was working directly under and likely to get it on my face I didn’t want to use anything more caustic. It came out very clean. I used a wheeled stool, a wheeled creeper, and a wheeled bucket to ease getting around under there. I let it dry for a week before painting.

I masked all the metal items and the water line of the boat, the trailer, and the floor. The paint went on mostly with a roller but I used a brush for the tight spots. A good gas mask and nitrile gloves are a must. All the garage windows were also opened for ventalation. 1 gallon ($130 from West Marine) did the whole boat with one coat on the bottom and two on the sides. The existing paint was in pretty good shape on the bottom and I didn’t want it build up too thick so I didn’t add a second coat there.

Here is a photo of the finished product.



After letting the paint cure for another week I plan to drop the boat back down and paint the areas where the jacks and stands were. While this initial job only saved a little money after buy the boat stands it saved multiple trips to the boat yard and I am now set up to give the boat bottom new paint as needed for just the cost of paint and supplies.

Edit: After drying I wasn’t happy with the coverage and added another coat all around.
 
On my previous boat, which was only a 21ft wood boat, a RT-21EC sized boat. I lifted the boat on the keel like you did, and just let the boat tip over onto the bunks on the other side from which I was painting as I was lifting. This was the recommended procedure from the boat builder. Sanded and painted one side, set the boat back down then lift it back up and tilted it to the other side. I only had to go back and touch up the points where the jacks were. Not sure I would try it on a boat that is as top heavy as a RT-27.
 
ixlr8":hhqsxr5y said:
On my previous boat, which was only a 21ft wood boat, a RT-21EC sized boat. I lifted the boat on the keel like you did, and just let the boat tip over onto the bunks on the other side from which I was painting as I was lifting. This was the recommended procedure from the boat builder. Sanded and painted one side, set the boat back down then lift it back up and tilted it to the other side. I only had to go back and touch up the points where the jacks were. Not sure I would try it on a boat that is as top heavy as a RT-27.

No, I would not be comfortable with doing that with the r27! 😱
 
Looks good! My experience has been that I get one season per coat. Then again I use the boat year round. I also have decided that I no longer do roofing or bottom paint. :lol:
 
Nice job! Thanks for the pictures. I have an old set of Brownell stands that I may use some of the components and fabricate a similar lift system for my trailer so I can clean and paint the bottom without lifting it off the trailer. When I prepped and painted the boat bottom I used the marinas Yard Arm Lift to lift the boat off the trailer. That will not always be available to me. It looks like your set up worked good. Another project :shock:
 
I have painted the bottom a couple of times by not removing the trailer. I use traditional boatstands that are always for sale on Craigslist. I start with a hydraulic floor jack and lower the trailer tongue to the ground. Place two stands at the rear good and tight. Jack the tongue up, weight transfers to the stands and off the trailer. I use a bottle jack to raise the bow and support the boat on the sides with two more boat stands. I remove the two bow supports from the trailer for more room.
Real P.I.A. crawling under there to work. Next time I may pay someone to do it. Learning to pick my battles..
 
Brian B":3rmkv47e said:
I have painted the bottom a couple of times by not removing the trailer. I use traditional boatstands that are always for sale on Craigslist. I start with a hydraulic floor jack and lower the trailer tongue to the ground. Place two stands at the rear good and tight. Jack the tongue up, weight transfers to the stands and off the trailer. I use a bottle jack to raise the bow and support the boat on the sides with two more boat stands. I remove the two bow supports from the trailer for more room.
Real P.I.A. crawling under there to work. Next time I may pay someone to do it. Learning to pick my battles..

Sounds like a good system. Using the trailer jack is a great idea to do this with one bottle jack! Since I already had had two bottle jacks I just went with them. Also regular floor boat stands would work fine but I liked the idea of less items on the floor to give me more room to maneuver around. The rolling floor creeper made the job much more tolerable. If I had to crawl it wouldn’t happen!
 
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