Getting Under the Trailer Bunks to Clean the Boat Bottom

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Captain Aurora
Posts: 878
Joined: Fri Aug 13, 2004 10:24 am



Jim Smith Asked:

How do I get between the trailer bunks to clean & polish my boat bottom. I want to apply your VS721 Bottom Coat on the bottom of my boat, but it’s on a trailer and I need to get at the bottom that is supported by the bunks so I can clean it and apply the VS721 Bottom Coat. How can I do this without renting a crane?
Last edited by Captain Aurora on Thu Jul 20, 2006 2:13 pm, edited 1 time in total.

Captain Aurora
Posts: 878
Joined: Fri Aug 13, 2004 10:24 am

PROCEDURE FOR TEMPORARILY RAISING BOATS OFF TRAILERS.

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FIBERGLASS BOATS:
When cleaning the boat bottom with ALGAE STRIP, GREEN GENIE, WATERLINE STAIN REMOVER or BOAT SCRUB and protecting the bottom with VS721 it's important to get the boat up off the bunks or rollers so that you can clean and protect the entire boat bottom, otherwise you will be left with unsightly patches that can negatively effect the boats performance and will result in poor performance and future damage to those sections of the boat hull.

INFLATABLE BOATS and RIB's:
When cleaning your inflatable boat or RIB with FOUL OFF, INFLATABLE BOAT CLEANER, INFLATABLE BOTTOM SPRAY, or SPEED CLEAN and protecting the bottom with POLY GUARD and REPELIN
, it's important to get the boat up off the bunks so that you can clean and protect the entire boat bottom, otherwise you will be left with unsightly patches that can negatively effect the boats performance and will result in poor performance and future damage to those sections of the boat hull.

EQUIPMENT REQUIRED:
1. Hydraulic Bottle Jack of a capacity that meets or exceeds the weight of your boat.
2. 9 to 12 cinder blocks or wooden blocks 8" x 8" x 16"
3. 2” x 8” planks cut to 16” length pieces. You will need a minimum 3 pieces, but more may be required.
4. Wooden shims as required

CAUTION: This is a safe procedure when done correctly and with care. If you do not feel confident in your abilities or equipment to handle heavy weights, do not lift your boat in this way, get professional help

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1. Place the boat and trailer on a firm, level surface [Diag.1].

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2. Lower the tongue of the trailer to the ground to elevate the transom. [Diag.2]. You may need a friend to help keep the tongue down.

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3. Block the transom using cinder or wooden blocks [Diag.3]. Make sure that there is a 2”x8”x16" wooden plank between the boat and the blocks to prevent damage to the boat. If the blocks and wood to not fit between the ground and the boat, you may have to use additional pieces of 2”x8”x16" wooden plank to compensate for the difference. If the bottom of your boat is angled, use scrap lumber shims as required between the blocks and the hull.

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4. Place a hydraulic bottle jack under the tongue of the trailer and raise the front of the trailer [Diag.4]. When the jack extends as high as possible, you may have to place blocks and wooden plates under the keel (at the forward bulkhead location), to support the boat. Then lower the jack and use wooden plates under the jack to give you additional height. Continue jacking up the trailer. This procedure may have to be repeated several times to gain the necessary height.

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5. Continue raising the front of the trailer until the boat is level or slightly bow high. Place blocks with a 2”x8”x16" wooden plank on top, under the keel at the forward bulkhead to support the boat [Diag.5]. Start lowering the jack until the weight of the boat is supported on the three columns of blocks and plates. Make sure that the boat is well supported on each column and is stable.

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6. Lower the bottle jack. Extend the trailer jack to support the tongue and remove the bottle jack [Diag.6]. The boat should be well supported and stable on all three columns and the bunks of the trailer should be about 6 to 8 inches lower than the bottom of the boat. This will give you clearance to clean and polish the areas normally supported by the bunks.

7. Do not remove the trailer. It will act as a safety device to catch the boat in the event that it slips off the blocks or if one of the blocks breaks or the ground becomes infirm and the blocks sink.

8. Do not proceed to work on the boat until it is well supported and stable.

9. To reseat the boat on the trailer, reverse the above procedure.



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