- Joined
- Oct 25, 2011
- Messages
- 25,054
Re: my minor boat restoration...first boat on a budget! 84 dixie ski 19' runabout
Based on having the deck out*, and not mentioning that there has been any 'flex' in the hull while working on it, I would use the 2lb. The 4lb is more expensive, as in equal quantities (it's sold by weight), it only fills half as much as the 2lb. In equal quantities by volume, 4lb weighs twice as much.... 2lb per Ft*3 vs 4lbs per Ft*3 (Ft*3 = cubic feet). In small quantities, 2lb & 4lb come in a 4lb kit for $22.50. The 2lb foam kit fills 2 Ft*3 and the 4lb foam kit fills only 1 Ft*3. So to fill the same size volume of 4 Ft*3, you'd use $45 in 2 kits of 2lb foam, but $90 in 4 kits of 4lb foam.
You should watch some YouTube videos on the use of expanding urethane flotation foam. It goes quick once it starts to kick after mixing. And using too much can force distortion into the surfaces surrounding it. Using too little can make it difficult to fill the remaining areas, depending on how the cavity was initially under filled.
Here is 1:
*You want to take a close look down the hull from many different angles & make sure nothing has moved out of place, sagged, dipped, kinked etc before getting too far into the tear down & put back.
Patrick was very careful, meticulous even, on his teardown & starting put back on his ChrisCraft Lancer. And he still ended up with a problem that may have been much harder to correct if he had proceeded much farther:
Based on having the deck out*, and not mentioning that there has been any 'flex' in the hull while working on it, I would use the 2lb. The 4lb is more expensive, as in equal quantities (it's sold by weight), it only fills half as much as the 2lb. In equal quantities by volume, 4lb weighs twice as much.... 2lb per Ft*3 vs 4lbs per Ft*3 (Ft*3 = cubic feet). In small quantities, 2lb & 4lb come in a 4lb kit for $22.50. The 2lb foam kit fills 2 Ft*3 and the 4lb foam kit fills only 1 Ft*3. So to fill the same size volume of 4 Ft*3, you'd use $45 in 2 kits of 2lb foam, but $90 in 4 kits of 4lb foam.
You should watch some YouTube videos on the use of expanding urethane flotation foam. It goes quick once it starts to kick after mixing. And using too much can force distortion into the surfaces surrounding it. Using too little can make it difficult to fill the remaining areas, depending on how the cavity was initially under filled.
Here is 1:
*You want to take a close look down the hull from many different angles & make sure nothing has moved out of place, sagged, dipped, kinked etc before getting too far into the tear down & put back.
Patrick was very careful, meticulous even, on his teardown & starting put back on his ChrisCraft Lancer. And he still ended up with a problem that may have been much harder to correct if he had proceeded much farther:
But not all, may have to call a few to find 1 that will.