5200 bedding

[kraker]

I just want too throw this out and see what comes back....I was walking around in a boat tard several years ago and stopped too talk to a fellow that had a large wood power boat.. He had wooded it down and was trowling 5200 on the sides of the boat and then putting glass cloth directly into the 5200.......He claimed that was the way toosave an old wood boat......Has any one else seen this or done it??? It seems too me its a good idea..If you have ever bedded any thing with 5200 it is now a permanent part of the boat......

[GordMay]

"3M" 5200 is a very tenacious polyurethane structural sealant, often used as a permanent (or semi-permanent) bedding compound. I’ve never seen it used, as you describe, in lieu of a laminating resin; and would not recommend that application. I don’t see how the 5200 sealant would possibly “wet out” the FRG cloth.

Use a proper epoxy, polyester or vinylester laminating resin.

Gord

[Jeff H]

I have heard of this being done on older wooden boats, but I think that the idea has pretty much been discredited. There really is no good way to glass over a plank on frame wooden boat but that does not keep people from trying all kinds of ideas. The mostly widely accepted method is to refasten the hull and repair all damaged frames. Strip the planking down to bare wood inside and out. Coat the living daylights out of the hull) with 3 coats of a saturating epoxy(both sides). Layup 3 or 4 laminations with epoxy and heavy cloth. Fair the laminate and coat with an epoxy barrier coat. The short coming of this technique is that it adds a lot of work and sooner or later the planing will rot out from the inside out.

The 5200 method, called for all of the steps from above except that after the hull was saturated a layer of 5200 was applied and allowed to cure. Then the layers of glass were added. The 52oo was supposed to allow for small amounts of movement between the hull and the sheathing.

Jeff

[svJasmine]

I don't think this would be a good idea. I am against this, except when a workboat could be given a couple of years more life. You have to mechanically attatch the glass to the hull. It WILL delaminate over time. You are essentially using the old boat as a mold.

There was a good book on this subject I think I still have.

adds alot of weight. It will rot.

my $.002

rich

[harryrezz]

Chalk off one more old wooden boat!