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Author Topic: multiple questions about 2 liter soda bottles  (Read 6361 times)
Professor J. Cogsworthy
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« on: May 01, 2012, 06:14:11 pm »

What is the right paint for  two liter soda bottle plastic? I am thinking
of using a clear bottle and painting the inside with metallic brass
( and then MAYBE filling it with expanding spray foam*)

When you remove the label you still have glue and bits of the label....
What solvent will remove that without dissolving the plastic?

Thinking about using air pressure and heat to round out the bottom
of the bottle. Anyone who has done this have any advice before I
start?

*I'm wondering how to keep the foam from over expanding and making the
bottle bulge out of shape too.......
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Herbert West
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« Reply #1 on: May 01, 2012, 06:38:01 pm »

Your post reminded me of this Blog article. Might it be of some use?

http://mrxdesigns.blogspot.com/2011/05/steampunk-diving-space-helmet-pt-1-wip.html
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frances
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« Reply #2 on: May 02, 2012, 01:01:54 am »

I use something called 'sticky stuff remover'.

Oh yes it is, it really is.
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von Corax
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« Reply #3 on: May 02, 2012, 01:16:35 am »

My father and I just use really hot water to get the labels off the bottles we use for wine. The glue seems to be a low-temperature hot-melt.

We've also discovered (the hard way) that if you fill a 2-litre soda bottle with boiling water, you get a 1-litre soda bottle...  Embarrassed
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Mr. Boltneck
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« Reply #4 on: May 02, 2012, 01:51:13 am »

Warm water with a little chlorine bleach removes most labels and greasy prints from glass. It may work on plastics.
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Professor J. Cogsworthy
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« Reply #5 on: May 02, 2012, 02:54:15 am »

My father and I just use really hot water to get the labels off the bottles we use for wine. The glue seems to be a low-temperature hot-melt.

We've also discovered (the hard way) that if you fill a 2-litre soda bottle with boiling water, you get a 1-litre soda bottle...  Embarrassed

How big of a mess did the water make hen you did it? When I did it it was in the sink when it started shrinking....
« Last Edit: June 08, 2012, 08:02:49 pm by Professor J. Cogsworthy » Logged
von Corax
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« Reply #6 on: May 02, 2012, 03:04:57 am »

My father and I just use really hot water to get the labels off the bottles we use for wine. The glue seems to be a low-temperature hot-melt.

We've also discovered (the hard way) that if you fill a 2-litre soda bottle with boiling water, you get a 1-litre soda bottle...  Embarrassed

How bid of a mess did the water make hen you did it? When I did it it was in the sink when it started shrinking....

It didn't, actually. We were rinsing the sanitizer out of them by pouring in a few ounces of hot water, screwing the cap on and giving it a really good shake (which also causes the label adhesive to release.) Somehow my father had gotten the idea that "boiled water" meant "boiling water" and poured straight from the kettle.

Mind you, the shrunken bottle did spit quite hard when we removed the cap.
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Maets
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« Reply #7 on: May 02, 2012, 04:11:43 am »

Put the cap on the bottle and use a heat gun to slowly and evenly shrink the 2 liter bottle.  It tends to round off the end.  Once shrunk remove the cap.  Becareful.
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Professor J. Cogsworthy
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« Reply #8 on: May 02, 2012, 12:00:00 pm »

Put the cap on the bottle and use a heat gun to slowly and evenly shrink the 2 liter bottle.  It tends to round off the end.  Once shrunk remove the cap.  Becareful.

I'll try that if my plan doe not work

I'm thinking of trying to fill up to the part of the bottom that needs rounding with water
Add a little pressure ( I'm still thinking about how to do that...lol ) and then invert the bottle
and use a heat gun to soften the molded 'feet' and hopefully it will allow the pressure to
evenly round the bottom out....



Any suggestions on specific types of paint?
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Mister P
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« Reply #9 on: May 05, 2012, 12:27:13 am »

I'm thinking of trying to fill up to the part of the bottom that needs rounding with water
Add a little pressure ( I'm still thinking about how to do that...lol )

Put some vinegar in with the water and then add a teaspoon or two of bicarbonate of soda (baking powder). Quickly screw on the lid and the pressure will build.
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« Reply #10 on: May 05, 2012, 12:39:07 am »

I'm thinking of trying to fill up to the part of the bottom that needs rounding with water
Add a little pressure ( I'm still thinking about how to do that...lol )


Put some vinegar in with the water and then add a teaspoon or two of bicarbonate of soda (baking powder). Quickly screw on the lid and the pressure will build.


Diet coke and Mentos also work.

Just be careful not to bang the cap on anything while you have the pressure up. You'll end up with a rocket on your hands.

Diet Coke + Mentos FAIL
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Professor J. Cogsworthy
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« Reply #11 on: May 05, 2012, 03:01:13 pm »


Put some vinegar in with the water and then add a teaspoon or two of bicarbonate of soda (baking powder). Quickly screw on the lid and the pressure will build.

Duh..... that's way too obvious.....

THANKS!
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Captain Quinlin Hopkins
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« Reply #12 on: May 09, 2012, 04:15:44 am »

You could use the low expanding version of the foam to keep it from bulging, but foam in a can are kept liquid by their acetone content.  Not likely to get any paint to hold up well to that type of solvent but it might evaporate fast enough not to cause an issue.  Might create some interesting effects though.  Would be well worth the cheap experiment to find out.

Also, hot melt glue, is not actually a glue, but a low melt temp plastic.

It might help if we knew what your end attempt is to be about.  If you are willing to fill it in.  You could possibly find something else and make it in two pieces and attach? 
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« Reply #13 on: May 09, 2012, 04:45:39 am »


Put some vinegar in with the water and then add a teaspoon or two of bicarbonate of soda (baking powder). Quickly screw on the lid and the pressure will build.

Duh..... that's way too obvious.....

THANKS!

 You could also drill a hole in the cap and pull a tubeless tire valve stem through it. Screw the cap onto the bottle and inflate with a bicycle pump. Incidentally, you'll be able to check the PSI with a tire gauge as well.  Wink
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Professor J. Cogsworthy
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« Reply #14 on: May 09, 2012, 02:53:23 pm »

It might help if we knew what your end attempt is to be about.  If you are willing to fill it in. 
You could possibly find something else and make it in two pieces and attach? 


The project is a super cheap lightweight jet pack as a 'play with whenever' toy
for my daughter.... and a technique learning opportunity for me.
( she is not going to get the dragonfly jet pack for everyday )

For the jet pack I wanted it to be quick, simple, lightweight, cheap and easy to
replace but as nice as I can make it with those characteristics.
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Narsil
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« Reply #15 on: May 09, 2012, 06:15:29 pm »

If you;re going to fill it with expanding foam anyway I might be tempted to cut the bottle off the foam after it has set and paint that. It's easier to paint and you can sand and carve into it to add detail and adjust the shape relatively easily.

The foam itself doesn't actually generate that much pressure, especially bearing in mind that carbonated drinks bottles are designed to contain a moderate amount of pressure anyway.  a bit of excess will just make the foam denser. you should be able to find out the proportion by which it expands and use that to work out the approximate amount you want to use to fill the bottle.
« Last Edit: May 09, 2012, 06:17:24 pm by Narsil » Logged







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Professor J. Cogsworthy
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« Reply #16 on: May 09, 2012, 06:44:38 pm »

If you're going to fill it with expanding foam anyway I might be tempted to cut the
bottle off the foam after it has set and paint that. It's easier to paint and you can
sand and carve into it to add detail and adjust the shape relatively easily.

The unprotected foam may be a bit more disposable than I want.
It is not gonna hold up to playtime abuses
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Dr cornelius quack
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« Reply #17 on: May 09, 2012, 07:35:32 pm »

When I needed a large prop sausage (Don't ask!!), I used two plastic bottles, cut the bases off and telescoped one inside the other. A run of tape round the joint line sealed them up while I filled them with foam. The simple expedient of leaving the top off one end meant that the excess foam just overflowed without distorting the shape and could just be taken off with a craft knife and some scotchbrite. Cutting the necks from the bottles when the foam had cured left me with two round ends. I'd lay a few coats of papier mache over the outside to give a good paint holding surface  or even a coat of GRP for real durability.

Remember that Polyurethane foam is cured by the presence of moisture, so a misting of water inside the bottle will make for a better, more even foam.

I tend to use the 'Gun Grade' foam that has a separate applicator gun rather than the stuff that comes in an aerosol can. Much more reliable for getting an even, fine cell size and it works out cheaper if you're doing a few projects with a time gap between because the canned stuff goes of inside the can once you start to use it
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Professor J. Cogsworthy
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« Reply #18 on: June 08, 2012, 08:02:17 pm »

I tried filling the bottle so that the area I wanted to reshape was the only area
unfilled when I turned the bottle over and heating it with a heatgun.

It might have worked if I had more practice.


I heated up the plastic and gently squeezed the bottle to provide extra pressure
and I was making good progress until I got a small pinhole.... I might have gotten
too hasty and was going too fast and getting the bottle too hot.


I have achieved a round bottom accidentally while making quick mead..
( its pretty much honey flavored alcoholic soda pop that will sneak
up behind you, beat you up and steal your lunch money while making
you smile the whole time ) I may try water, a little sugar and some yeast...


I use an adapted recipe from.....

The Closet of Sir Kenelm Digby Knight Opened
« Last Edit: June 12, 2012, 09:37:21 pm by Professor J. Cogsworthy » Logged
MakerMike
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« Reply #19 on: June 12, 2012, 08:03:58 pm »

How about filling the bottle with sand (to provide weight) while gently heating the bottom.  The sand might provide enough force to relax out the "legs" and make a round bottom.  Other than that, there are some other interestingly shaped plastic bottles out there.  My son has some saved for a jet pack that have a nice curve to them (some sort of ice tea, I think...)
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Professor J. Cogsworthy
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« Reply #20 on: June 28, 2012, 09:13:34 pm »

I've got a bottle outside ( temps over 90 F ) with some yeast, sugar and water....


It's slowly working....

I'll get a photo later ( I have a couple things I wanted to take pics of for the
forum anyway.... )


I probably should have used more water.... and sugar but it is slowly
rounding the bottom of the bottle..... I left it go because opening
the bottle to add sugar would depressurize it so I'll just let this one
go until I get the result I wanted or it becomes clear no more progress
is being made.



More water would force the pressurizing air into a smaller area and give
me more bang for the buck..... Water does not compress air does. Less
air space would have made this work faster ( It has been three days so
far)

More sugar would have given the yeast more to eat... See above three days
comment...... There can't be much sugar left for the yeast to make CO2 farts
with..
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Professor J. Cogsworthy
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« Reply #21 on: June 29, 2012, 12:54:07 am »

The promised pictures.....





It's not perfect, but it's not bad.....pretty good actually...


I think more.... of everything ( but the yeast ) will give me the slight improvements I'd like to
get
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