Another "OMG circular saw accident" in an odd location.

[woyd]

Re: Another "OMG circular saw accident" in an odd location.

I like the Boat. I was in your same boat last year when I started. Never fiberglassed before but was very mechanically knowledgeable. I will say this it really is not going to be that hard to fix. Only because I did the same thing, not quite as big but same concept. Here is a recomendation that I got.

get a piece of wood that goes the length of the cut, cover it with wax paper, find a way to hold it up tight, duck tape is good, I used a jack to just put pressure, put some pb in the cut then cover it with 1708, I did 4 layers way over kill but I will take the added assurance of nothing to worry about.

I really under estimated how much resin I would need, mostly because of the amount of PB I had to make. I got 10 gallons and I have gone through 7 gallons and all I have glassed in was my transom and made some hull repairs. Just so you have an idea.

Hello Im new I know.

How would this repair be any different then a Tear or crack in the boat ? how would you fix this ?

 

[Woodonglass]

Re: Another "OMG circular saw accident" in an odd location.

Guys, this is a "Cored" hull. This means that the hull of the boat is constructed with a Fiberglass outer layer and inner layer with a 1/8 - 1/4" layer of end grain balsa wood sandwiched in-between the two layers of Fiberglass. The repairs on this type of hull are similar but different. The repair to the outside layer of fiberglass is basically the same as any fiberglass hull but then you must deal with the core material( balsa wood or foam) getting it laminated to the outer hull and the inner hull glass too!

 

[Matthew103]

Re: Another "OMG circular saw accident" in an odd location.

1/2 inch balsa is what's used. I plan to repair the crack by grinding a beveled egde on both sides of the cut and building it up with mat. I think 3-4 layers on each side will be fine.

This is just what I gather from my research. I think filling it with PB will compromise strength.

 

[Woodonglass]

Re: Another "OMG circular saw accident" in an odd location.

You need to use some 1708 biax too! My recommended layup would be CSM, 1708, Csm, 1708 on the inside 2" overlaps. On the outside it should be CSM, 1708, CSM CSM.

 

[Matthew103]

Re: Another "OMG circular saw accident" in an odd location.

I had planned to finish everything in 1708. It seems most guys go with two layers of mat and then 1708 to finish. I am still a week away from planning the rebuild stage so I have plenty of time to research.

Mertons suggests that I use hull and deck putty to bond the wetted balsa to the hull. Then two layers of mat and some 1708 to finish it.

The original skin was VERY thin, maybe 1/8in.

 

[Matthew103]

Re: Another "OMG circular saw accident" in an odd location.

supplies will arrive monday!

 

[Yacht Dr.]

Re: Another "OMG circular saw accident" in an odd location.

Hello Im new I know.

How would this repair be any different then a Tear or crack in the boat ? how would you fix this ?

Exactly ! .. Its basically no different other than you dont have the delamination in the fiberglass that normally comes with impact or tear damage. Its a clean cut so you dont have to Grind as much as you would with a Damaged section.

1/2 inch balsa is what's used. I plan to repair the crack by grinding a beveled egde on both sides of the cut and building it up with mat. I think 3-4 layers on each side will be fine.

This is just what I gather from my research. I think filling it with PB will compromise strength.

You are correct... sorta .. However the outside will only take as much glass as it takes ( unless you dont mind a big lump on the outside ) .

I had planned to finish everything in 1708. It seems most guys go with two layers of mat and then 1708 to finish. I am still a week away from planning the rebuild stage so I have plenty of time to research.

Mertons suggests that I use hull and deck putty to bond the wetted balsa to the hull. Then two layers of mat and some 1708 to finish it.

The original skin was VERY thin, maybe 1/8in.

I would try to end with Mat and keep the 1708 in tact on the outside lams. This way your not grinding/fairing into the 1708 comprimising the material. Basically start with one layer of mat .. then add your 1708 INVERTED ( mat side UP ) until your almost fair .. then finish it off with mat.

Im sure glad you decided to do inside and outside repairs .

Keep us updated mate ..

YD.