Peanut butter.

[FluffyChicken]

I keep reading about this "peanut butter" i did a search for it and all that i can find is where to use it. But how do you make it. You dont really use real peanut butter for placing floor supports and stringers do you?

 

[Boomyal]

Re: Peanut butter.

'Peanut butter' is an epoxy or polyester resin, thickened with various substances to create a sticky, no sagging filler or adhesive.

Three of the common additives are milled fibre for strength, cabosil for glue and micro bubbles for easily sandable filletting.

 

[iwombat]

Re: Peanut butter.

. . . All of which make pretty lousy sandwiches.

 

[FluffyChicken]

Re: Peanut butter.

do you have to use this to mount the floor supports and stringers to the hull? or can you use something else. What filler would i add to polyester resin to do this? also what is the mix ratio?

 

[Boomyal]

Re: Peanut butter.

do you have to use this to mount the floor supports and stringers to the hull? or can you use something else. What filler would i add to polyester resin to do this? also what is the mix ratio?

I would use cabosil. Keep mixing it in untill you achieve the consistancy that you are comfortable with. I find that I have added enough when the consistancy goes from creamy to a dryer pulling of the mix, as you mix it.

I would evenly radius out the peanut butter, where the stringer meets the hull. This will help spread the load of the stringer. Also if you cover the stringer in glass, it will help in laying the cloth down the stringer and out onto the hull.


I would do some searching to find your components. Little cans of cabosil, that you would buy at the local marine supply will bankrupt you. I buy mine in gallon tubs from US Composits.

 

[Boomyal]

Re: Peanut butter.

oops!

 

[iwombat]

Re: Peanut butter.

Tap plastics sells 'em in nice quart sizes for fairly reasonable prices.

 

[Bondo]

Re: Peanut butter.

Ayuh,......

I just dropped about $400. Today at raka,com for Epoxy resins,+ Abunch of Fillers......
6gals. of Resin,....
And a 5lb. bag each of Milled,+ Chopped Glass.......
I've still got a fair amount of Cabosil,+ Bubbles.......

Gittin' started on some of those Houseboat Repairs......
Gonna rebuild the 3 Hatch Covers......

 

[Boomyal]

Re: Peanut butter.

Ayuh,......Gonna rebuild the 3 Hatch Covers......

Boy, I'd hate to have to lift those hatch covers if'n yer gonna throw all those goods at em!:$

...and why are all those good priced suppliers in FL? All but eats up the good prices with today's exhorbitant shipping costs.:|

 

[Chris1956]

Re: Peanut butter.

Northcoast, When I am bonding stringers to the hull or the floor to the stringers I lay resin saturated strips of cloth or mat between the two, to take up the open spaces. I reserve the Peanut butter for snacks or filling goofs in my fiberglass work.

 

[Robj]

Re: Peanut butter.

When I make peanut butter, I kick the resin first, mix it well, add some chopped strand and then cabosil, mix it well again, and then hurry to put it onto the stringer and then bed it to the hull. Once you have it down make a radius where the stringer meets the hull for glassing. I am unsure how I will be installing the floor to the stringer, but at this point I am considering using 5200 with ss screws.

 

[bilgeboy]

Re: Peanut butter.

Oh this one gets me.

"Peanut Butter Consistancy" is the term. All of the posts above discuss ways to achieve this.

I'm not a professional, but I do read alot, and from what I can see, the jury is out on whether to secure the stringer to the hull or not.

Please see this link, for instance.

http://boatdesign.net/forums/showthread.php?t=10680&highlight=stringer+bedding

If you search that site, and it is a good one, there are lots of thoughts on how to do this correctly.

Good Luck,

Mike

 

[Nova II 260]

Re: Peanut butter.

Peanut butter: Most prefered is creamy, although chunky would work. 8)
Just mix it till you get the consistency to allow for verticle non sagging application. About like driwall mud or bondo.

 

[FluffyChicken]

Re: Peanut butter.

Northcoast, When I am bonding stringers to the hull or the floor to the stringers I lay resin saturated strips of cloth or mat between the two, to take up the open spaces. I reserve the Peanut butter for snacks or filling goofs in my fiberglass work.

So what your saying is that all this "peanut butter" stuff isn't 100% neccessary? I like the sound of that. What im doing in my boat currently is the orignail floor supports and stringers that i tore up i left about 1 inch on the bottm left of them. i am now digging the old wood out and will let them dry out then i should be able to just throw my new wood in there and it should be good to go????? just glass over it and be on my marry way. and that one website says to not attach them to the hull at all and to put foam in between so theres no stress in only one area. hmmmmmmm.... sounds cheaper and perhaps safer?


thanks in advance.

 

[Bondo]

Re: Peanut butter.

Ayuh,......Gonna rebuild the 3 Hatch Covers......

Boy, I'd hate to have to lift those hatch covers if'n yer gonna throw all those goods at em!:$

...and why are all those good priced suppliers in FL? All but eats up the good prices with today's exhorbitant shipping costs.:|

Naw,...... It's Not All going into the Hatches,........
I've got Abunch of repairs to do,+ It's Cheaper by Volume,......
Soo,....... I got the 6gal. Kit........ $264.00 for 6gals. is Pretty Reasonable,.... It's $100.00@gallon up here, Regardless of the Volume bought......

and that one website says to not attach them to the hull at all and to put foam in between so theres no stress in only one area. hmmmmmmm.... sounds cheaper and perhaps safer?

Ayuh,........ Just Remember,.... That's just 1 Man's theory.........

I prefer to build a Solid hull,+ let it flex Together...........

 

[Yacht Dr.]

Re: Peanut butter.

I agree with Bondo..for that small of a boat Ive never heard of using foam. IF it did flex that much then you probably hit the dock or a rock at high speeds hehe

Now major bulkeads ? yes you dont want a hard point on those. however you dont have major bulkies so no worries .

Glass and bed the crap outa everything . If you did use those cool wedgies of foam, bye the time you have them cut and fit correctly I would be cleaning up my roller and having a cold brewski.

Cheers YD

 

[Robj]

Re: Peanut butter.

I was also faced with the dilema, to bed or not to bed the stringers, after asking many questions I decided to bed them. My boat is a 18 foot bowrider, and with regards to installing bulkheads YD suggests just to bed them? or should there be a gap between the hull and the bulkhead?

Northcoastpowerband, if you are going to use the shell from your old stringer to bed your new one, you must clean and sand it very well, seal the new stringer with resin and then I would still bed the new stringer in peanut butter.

 

[Chris1956]

Re: Peanut butter.

Northcoast, I would bed the stringers to the hull. If the OEM used foam, I would replace it. If not, I would consider adding it. Foam adds a heck of a lot of strength and no weight.

If you do not bed the stringers to the hull, the hull will flex a bit with each wave. I think the hull could crack under this circumstance. I had a hull crack on my SeaRay 19 BR. I believe it was not foamed properly, allowing the FG to flex too much. It cracked on a strake, which is one of the strongest points on the hull. Luckily I didn't sink.

BTW the stringers were intact. I reinforced the crack in the hull with lots of glass, added a stringer which bisected the strake and doubled up the original stringers for good measure. I also refoamed it.

 

[Realgun]

Re: Peanut butter.

Heres the true story of peanut butter.
Personally I like epoxy so-
Mix the epoxy at the ratio needed.
Then add-
For strength- milled glass fibers. The shorter the fiber, the less strength, however it is easier stir and sand.
Cabisil- foamed silica- sand, adds nothing but bulk and thinkens the mixture quicker.
Bubbles- makes the mixture lighter and easier to sand but less stregth.
I personally use 1/4 milled glass.

 

[CILO]

Re: Peanut butter.

All this talk of peanut butter brings another thing to mind:

http://home.comcast.net/~etrata/flash/banana.swf