- Aug 8, 2008
- 2,984
- Boat Info
- A 300 DA 4kw Gen-set, central vac, electric head, windlass, AC/reverse heat, Lowrance 522ci GPS Char
- Engines
- twin 5.7 with Alpha drives
80’s Sundancer / Weekender Swim Platform Extension
This thread will deal with the rebuild of a swim platform, rebuilding to a 40" deep will be another thread.
Tear Down Post
The size of the swim platforms on the 80’s boats were really far too small as were a lot of boats of the 90’s . The information in this file will show you not only how to repair your swim platform but extend it from its depth of 22” to 40”, big enough to put a couple of lawn chairs out and a cooler full of beer.
Figure 1 Factory Platform Figure 2 Extended Platform
There a few reasons that I can think of for doing this project; the swim platform is rotting or water logged or you are just tired of such a small platform. Once the integrity of the platform is compromised it is just a matter of time before it will need to be replaced or repaired. Figure 3 and 4 show the seam of the top shell and the bottom shell. Once water gets and if you live in a cold climate like I do it’s just a matter of time before the water freezes and the damage gets worse.
Figure 3 Split seams Figure 4 Split seams and a missed bracket backer
I decided to cut the platform open using a cut off wheel and a dust extractor to keep the dust under control. A 4” grinder with a 1/8” blade on it will work just as well, I also wore a dust respirator suitable for this type of work. Notice in figure 5 and 6 how wet the wood is underneath the bottom fibreglass layer.
Figure 5 Figure 6
Notice in figure 7 you can read the label from the original wood that Sea Ray used when they built the platform.
Figure 7
The wood used is exterior sheathing, not marine plywood that many people believe is used in boat construction. None of the holes on this platform were sealed with any type of sealant. This probably led to the failure of the wood.
Once all of the bottom skin is cut off you can now remove the wood. I used an air chisel with a 1 1/2 “ flat blade bit.
Figure 8 The platform was built from 3 pieces of wood. Figure 9 The wood is saturated and crumbles easy
Figure 10 shows how the original platforms wood was cut and fitted with three pieces of wood. The wood was not cut and fitted equally in the top shell before the fibreglass bottom was poured. The swim platform is not perfectly flat there is a slight curve starting in the center and going out to the edges. The platform is over 9 feet wide and requires the use of at least 2 pieces of plywood. I decided to use 3 pieces, one small piece in the center and the two outside pieces exactly the same size and shape.
Figure 10
This picture shows the seam in the center with one large piece of wood and 2 small pieces. Notice there is no sealant around the holes for the swim ladder.
Here are some pictures of the wood that was removed from the platform, even if I was not stretching the platform I would remove all the wood and re-glass the bottom. This process is very easy, quick and insures that you have removed all the contaminated wood.
This thread will deal with the rebuild of a swim platform, rebuilding to a 40" deep will be another thread.
Tear Down Post
The size of the swim platforms on the 80’s boats were really far too small as were a lot of boats of the 90’s . The information in this file will show you not only how to repair your swim platform but extend it from its depth of 22” to 40”, big enough to put a couple of lawn chairs out and a cooler full of beer.
Figure 1 Factory Platform Figure 2 Extended Platform
There a few reasons that I can think of for doing this project; the swim platform is rotting or water logged or you are just tired of such a small platform. Once the integrity of the platform is compromised it is just a matter of time before it will need to be replaced or repaired. Figure 3 and 4 show the seam of the top shell and the bottom shell. Once water gets and if you live in a cold climate like I do it’s just a matter of time before the water freezes and the damage gets worse.
Figure 3 Split seams Figure 4 Split seams and a missed bracket backer
I decided to cut the platform open using a cut off wheel and a dust extractor to keep the dust under control. A 4” grinder with a 1/8” blade on it will work just as well, I also wore a dust respirator suitable for this type of work. Notice in figure 5 and 6 how wet the wood is underneath the bottom fibreglass layer.
Figure 5 Figure 6
Notice in figure 7 you can read the label from the original wood that Sea Ray used when they built the platform.
Figure 7
The wood used is exterior sheathing, not marine plywood that many people believe is used in boat construction. None of the holes on this platform were sealed with any type of sealant. This probably led to the failure of the wood.
Once all of the bottom skin is cut off you can now remove the wood. I used an air chisel with a 1 1/2 “ flat blade bit.
Figure 8 The platform was built from 3 pieces of wood. Figure 9 The wood is saturated and crumbles easy
Figure 10 shows how the original platforms wood was cut and fitted with three pieces of wood. The wood was not cut and fitted equally in the top shell before the fibreglass bottom was poured. The swim platform is not perfectly flat there is a slight curve starting in the center and going out to the edges. The platform is over 9 feet wide and requires the use of at least 2 pieces of plywood. I decided to use 3 pieces, one small piece in the center and the two outside pieces exactly the same size and shape.
Figure 10
This picture shows the seam in the center with one large piece of wood and 2 small pieces. Notice there is no sealant around the holes for the swim ladder.
Here are some pictures of the wood that was removed from the platform, even if I was not stretching the platform I would remove all the wood and re-glass the bottom. This process is very easy, quick and insures that you have removed all the contaminated wood.