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What is this stuff on my new bike?

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What is this stuff on my new bike?

Old 06-17-19, 06:43 PM
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What is this stuff on my new bike?

I picked up a 1985 Trek 720 to restore, and found this stuff on the side of the top tube. Anyone know what it is/how to remove it without damaging the frame or much of the paint?
Resin maybe?

Also, while I have you here...anyone know what this flaky stuff in the seat tube is? I've read not to worry much about a bit of rust as long as I clean it out. But the flaking is a bit weird?
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Old 06-17-19, 06:45 PM
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Frame saver maybe? Can you use a fingernail to scratch part of the stuff off the top tube?
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Old 06-17-19, 06:48 PM
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weird - is that a blistered decal? looks a bit bubbly.

it think there was some galling in your seat tube (with the seat post). My LBS has this drill attachment. It's got all these little stiff wire brushes that would kind of clean that up. It's kind of like a burnishing tool, maybe. A quick google search didn't find it for me. But I would think a quick touch up with a DREMEL wire brush or something similar would smooth things up for you.

https://en.wikipedia.org/wiki/Galling

Last edited by mrv; 06-17-19 at 06:49 PM. Reason: galling wiki
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Old 06-17-19, 06:48 PM
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Originally Posted by 3speedslow View Post
Frame saver maybe? Can you use a fingernail to scratch part of the stuff off the top tube?
A very small amount scratches/comes off to my fingernail mostly it's pretty hardened on
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Old 06-17-19, 06:51 PM
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Originally Posted by mrv View Post
weird - is that a blistered decal? looks a bit bubbly.

it think there was some galling in your seat tube (with the seat post). My LBS has this drill attachment. It's got all these little stiff wire brushes that would kind of clean that up. It's kind of like a burnishing tool, maybe. A quick google search didn't find it for me. But I would think a quick touch up with a DREMEL wire brush or something similar would smooth things up for you.

https://en.wikipedia.org/wiki/Galling
Ooh good to know. Thanks! Don't think it's a blistered decal. It's pretty hard and doesn't feel like vinyl or plastic
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Old 06-17-19, 07:15 PM
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Too bad there isn't a clear top coating on the frame because there is a danger of removing the decals.
The stuff on the tube might be glue, if this frame was mine I would get a q-tip and wet it with water and dab around the edges to see if it softens (staying away from the decal)...if that does not help, I would try mineral spirits in the same way...if that seems to soften the goo great...looks like a bit of the decal has already lifted...be careful and good luck.
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Old 06-17-19, 08:59 PM
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Looks like old dried epoxy or some other form of glue. Or maybe it started off as tree sap; if you get lucky you might even find a mosquito frozen in amber! Perhaps he was the most hated guy in the club and it's an old loogie (lugie?) that never got wiped off.

I try not to think too much about what precisely I'm cleaning off of a new acquisition.

Oh, and those are clearly alien spores inside the seat tube. Clean or quarantine, but do it quick.
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Old 06-17-19, 09:22 PM
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I think @Fahrenheit531 may be on to something. The stuff on the top tube looks like the sap that the Douglas Firs dropped on my car at my last house. If it's sap rubbing alcohol, applied carefully, will eventually remove it. Careful though, a little bit each day and rinse well after each use. It can remove the paint too.
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Old 06-17-19, 11:46 PM
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Careful!, it might be a rider's lugey that hardened and petrified itself on the top tube!
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Old 06-18-19, 12:48 AM
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Haha... Well regardless despite my initial frustration I managed to get it off without too much additional damage to the decal. The bike is pretty scuffed up, but otherwise in good shape to ride once I get the new wheels, brakes, and rear derailleur on...
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Old 06-18-19, 03:40 AM
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I wouldn't mind seeing the whole bike as it is now, as "before" pictures.
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Old 06-18-19, 04:21 AM
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Nice bike. 720 has a great ride. Enjoy!
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Old 06-18-19, 06:12 AM
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[QUOTE=Fahrenheit531;20983882 Or maybe it started off as tree sap; if you get lucky you might even find a mosquito frozen in amber! [/QUOTE]

This - It's pine sap / resin
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Old 06-18-19, 07:42 AM
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My immediate thought, before reading through the posts, was also tree sap.
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Old 06-18-19, 08:38 AM
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Looks like rust to me
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Old 06-18-19, 09:52 AM
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Originally Posted by 3speedslow View Post
Frame saver maybe? Can you use a fingernail to scratch part of the stuff off the top tube?
That would be my guess- once that stuff is on- it’s very “on.”

I’m glad you got it off.
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Old 06-19-19, 01:21 PM
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Originally Posted by mixteup View Post
This - It's pine sap / resin
aka balsam in our neck of the woods. One of my late mother's early-married-life cookbooks contains this transcription of an observation from (?three-year-old) me: "Giggy [my first attempt at saying "Grandpa", which stuck] uses Esso Escra to get the blossom off his hands." Context unknown but preserved lovingly to this day in my sister's attic.
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Old 06-19-19, 07:40 PM
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Originally Posted by bicybike View Post
I picked up a 1985 Trek 720 to restore,

And since we've gotten this far into the thread...

A 1985 Trek 720 you say...

MORE PIX!!!


Welcome to the 720/728 Membership Club. Your card and keys to the members lounge and pool are on the way- the secret handshake will be taught to you there.
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