Peanut Butter

Simon Sexton

Simon Sexton

.
Nov 1, 2017
635
Hunter 28.5 Galveston
Hey Everyone,

Good afternoon! I wanted to share with everyone a really recourseful idea that my Skipper taught me years ago when I first joined Sea Scouts; it's called "peanut butter". Essentially, when you sand down something made of fiberglass, empty the vacuum bag on the back end of your sander into a can or jar. After you collect a good amount of it, save it over time, and when you need a filler of some kind, simply mix the dust with resin, and you'll get a brownish paste that looks like (can ya guess?) peanut butter! This helped me out a whole lot because I'm not made of money, and I make A LOT of repairs on my projects; thus, Bondo gets expensive. Does anyone else know this trick? What do you think?

God Bless,
S.S.
 
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Roland5048

Roland5048

.
May 12, 2004
1,505
Hunter Cherubini 30 New Port Richey
Oops. I think I confused the name Bondo with a character with a name that rhymes . Let's see what happens here.
 
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31seahorse

31seahorse

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Aug 2, 2005
1,155
Pearson 33-2 & Typhoon 18 Seneca Lake
Bozo? (a clown) Bono? (a musician) Perhaps the OP meant Epoxy? Bondo is used on automobiles. And , yes, I have mixed sanding residue with epoxy to make the repair match the original material.....wood or fiberglass.
 
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dlochner

.
Jan 11, 2014
12,945
Sabre 362 113 Fair Haven, NY
Simon Sexton said:
Hey Everyone,

Good afternoon! I wanted to share with everyone a really recourseful idea that my Skipper taught me years ago when I first joined Sea Scouts; it's called "peanut butter". Essentially, when you sand down something made of fiberglass, empty the vacuum bag on the back end of your sander into a can or jar. After you collect a good amount of it, save it over time, and when you need a filler of some kind, simply mix the dust with resin, and you'll get a brownish paste that looks like (can ya guess?) peanut butter! This helped me out a whole lot because I'm not made of money, and I make A LOT of repairs on my projects; thus, Bondo gets expensive. Does anyone else know this trick? What do you think?

God Bless,
S.S.
Click to expand
Bondo? You said Bondo? The only thing worse than 5200 on a boat is Bondo.

Just say NO! to Bondo on boats!
 
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Charlie Jones s/v Tehani

Charlie Jones s/v Tehani

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Mar 1, 2012
2,182
1961 Rhodes Meridian 25 Texas coast
Simon- as a long time pro woodworker, and boat builder, I used to keep empty plastic peanut butter jars on the shelf with sanding dust in them. I kept the mahogany separate from the teak, etc. Had about 6 jars

Great idea

And Bondo has no place on boat!! Same as Silicone-THAT is not allowed on my boat!! Or any furniture I'm re-doing
 
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Apex

Apex

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Jun 19, 2013
1,212
C&C 30 Elk Rapids
haha great thread. and to the op a great idea. thanks for sharing.
bondo and 5200 in the same sentence.....ack! next comes silicone and I understand that reference as well as poor choices for materials due to either lobgevity or side effects and consequences later. but i havent learned about "apricots"
 
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Will Gilmore

Will Gilmore

.
Oct 19, 2017
7,976
O'Day Mariner 19 Littleton, NH
I was taught this many years ago for furniture restoration and repair. Not being marine related, we used yellow glue and my mentors being from the high style furniture reproduction camp, insisted that the dust be obtained by scraping from the endgrain of the wood. Sanding won't do because sand grit gets in. End grain scraping gives a finer dust than scraping from long grain, which tends to be more like a shaving than dust. Most of the time, I'm not so picky, but if the project calls for snootiness, I'm glad I know how to be snooty too. I actually think epoxy is a better all-round choice than a water-soluble glue in every case. Most of the time it is on an exposed surface and it is very bad form to have your repair soften and fall out because someone put a cold :beer:down on it.

Oh yeah, I just got done repairing a four panel dent down the side of my daughter's car for a salvage inspection. The Bondo was awesome, the salvage inspection process is something no one should ever do, except for a select few despotic, genocidal leaders of the past in the eighth level of Hell.

-Will (Dragonfly)
 
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dlochner

.
Jan 11, 2014
12,945
Sabre 362 113 Fair Haven, NY
Will Gilmore said:
Oh yeah, I just got done repairing a four panel dent down the side of my daughter's car for a salvage inspection. The Bondo was awesome,
Click to expand
The operative word in this statement is car. Notice the absence of boat, marine, vessel or any other maritime related word.

To quote the Trix Commercial, "Bondo is for cars, not boats." :poke::)
 
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Will Gilmore

Will Gilmore

.
Oct 19, 2017
7,976
O'Day Mariner 19 Littleton, NH
While I understand that Bondo is not for marine use, there are certain jobs inside a cabin where water should not be a concern, that I would not hesitate to use Bondo:poke:(right back at you). However, marine grade epoxy is just as easy and I probably will more likely have that on hand.

-Will (Dragonfly)
 
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dlochner

.
Jan 11, 2014
12,945
Sabre 362 113 Fair Haven, NY
Now that we have thoroughly trashed Bondo, an explanation is probably in order.

Bondo is a polyester resin with various fillers. The first issue is the polyester resin. Polyester works well in laminates when there is an opportunity for the layers of glass and resin to chemically bond together, however, it does not have the same adhesive properties as epoxy so when applied to a cured surface, it will not stick as well as epoxy. Epoxy has much better adhesion properties. Polyester resins can also shrink.

A second factor is the filler. Automotive Bondo is designed to be easily sanded and faired and covered with a high quality paint. In a marine environment, this didn't work so well. Back in the day, Bondo repairs tended to fail. The filler was also suspect as many believed that it absorbed water causing it to fail.

To be fair, there is now a marine Bondo that should not have the failings of Auto Bondo, but I won't be trying it out anytime soon. I'll stick to thickened epoxy or products like Interlux Watertite. :)

Simon Sexton said:
Holy crap, y'all, I said the B-word cause I couldn't think of the other word :biggrin::p
Click to expand
Two words: Fairing Compound
 
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Simon Sexton

Simon Sexton

.
Nov 1, 2017
635
Hunter 28.5 Galveston
dlochner said:
Now that we have thoroughly trashed Bondo, an explanation is probably in order.

Bondo is a polyester resin with various fillers. The first issue is the polyester resin. Polyester works well in laminates when there is an opportunity for the layers of glass and resin to chemically bond together, however, it does not have the same adhesive properties as epoxy so when applied to a cured surface, it will not stick as well as epoxy. Epoxy has much better adhesion properties. Polyester resins can also shrink.

A second factor is the filler. Automotive Bondo is designed to be easily sanded and faired and covered with a high quality paint. In a marine environment, this didn't work so well. Back in the day, Bondo repairs tended to fail. The filler was also suspect as many believed that it absorbed water causing it to fail.

To be fair, there is now a marine Bondo that should not have the failings of Auto Bondo, but I won't be trying it out anytime soon. I'll stick to thickened epoxy or products like Interlux Watertite. :)



Two words: Fairing Compound
Click to expand
Ah, well, there it is, then! Fairing compound. ;)
 
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