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RE: [PSUBS-MAILIST]bubbles



He is my older posting were I tested Rain-X. I have reason to believe that with a couple more coats of Rain-X polished in, it would work even better.  I had ment to test that but got distracted by some thing. I have not done any thing to the test tank since, so perhaps I can do that.

Regards,
Brent Hartwig
 
 
Fine Bubbles On External Acrylic Surfaces‏
From: Brent Hartwig (brenthartwig@hotmail.com)
Sent: Wed 8/29/07 1:32 AM
To: personal_submersibles@psubs.org

I've done another real live test, and yet again it's to late to head for the hills.
 
I took an old ten gallon glass aquarium I have, and applied two light coats of Rain-X on the inside of the front piece of glass only, and then buffed it off, as per the instructions on the bottle. Then I filled the tank with slightly hard, cold water with a spray type rinse hose, so I could create even more fine bubbles in the water as I filled the tank. I held the water stream in the middle at one end of the tank and so both the front and back surfaces received the same amount of bubbles. I didn't run the stream of water directly on the side glass surfaces as to not unduly disturb existing bubbles.  As I filled I notice that the bubbles that clung to the Rain-X treated surface were mostly in a couple of thin horizontal line areas where there was some previous calcification on the glass from the water level being at about the two inch mark and up near the top, for along time, when I used the tank for reptiles or as a fish tank.
 
As you can see in the pictures there is not nearly as many bubbles clinging to the Rain-X treated side, compared to the back side. I removed the bubbles on the right side end glass only, to be able to take better pictures. No I didn't remove any bubbles from the front piece of glass. If someone  doesn't believe me, they can easily do there own test. I'm aware this is not a test on acrylic, but it's what I had available at a short notice, at midnight, and I would expect the same or similar results on acrylic. I will test acrylic to verify that.  I can see that some of the edge areas, that I didn't buff as much as the center, have more bubble hanging of. I would expect that the&n! bsp;more applications of Rain-X you apply, the better it would be at keeping bubbles from clinging. I'll do that and test again after the tank has had time to dry.
 
It looks like Frappr is working properly again. Here are the pics on Frappr, starting with this one.
 
http://www.frappr.com/?a=viewphoto&id=4001713&pid=7686347
 
I don't know if the Rain-X product will do any kind of damage to acrylic. That will have to be tested over time and many test to really find out.
 
What are the bubble holding on to?  Are they hanging onto microscopic imperfections in the acrylics surface that can be filled in with something. Is surface tension an issue? Why do those tiny bubbles only cling to just previously dry glass or acrylic. When I have a bubble wand next to the glass in a saltwater aquarium, of which puts off very small bubbles in saltwater, why do the bubbles not stick to glass or acrylic that has been submerged for a day or more? Does water later fill in those tiny imperfections making it hard and/or impossible for new bubbles to cling to that surface until the water is removed from said imperfections?
 
Here is a quote off the front of a Rain-X bottle I have.
 
"Rain-X the invisible windshield wiper.  Dramatically improves wet weather driving visibility - dispenses rain, sleet & snow on contact - lets you see clearly - with and without wipers.  R! ain-X se als - polishes - protects glass & plastic windshields, side & rear windows, mirrors & lights with an invisible super - slick, non-stick coating, Makes water "bead" for aero-dynamic runoff. Rain-X restricts, bug, frost, salt, mud, oil, dust, & road film adhesion - makes cleaning a snap - prevents parching from sun, sand and pollutants."
 
From the sound of that, I would expect that Rain-X would be a pretty good thing to have on ones acrylic.


Regards,
Brent Hartwig




From: ShellyDalg@aol.com
Date: Tue, 4 Mar 2008 12:04:50 -0500
Subject: Re: [PSUBS-MAILIST]bubbles
To: personal_submersibles@psubs.org

Hi Dean. I'm still building mine so can't guarantee this, but I've been told by several people that tiny bubbles cling to the inside of a plexi fairing. I've been struggling with the shape of my front ballast tank/fairing because I want to protect the window and make the front as sleek as possible. Mostly for surface travel.
Maybe we could put a small tube that squirts water onto the plexi and blow the bubbles away once submerged or have some type of windshield wiper to push them off.
Maybe wiping it with that ''rain-X'' stuff would work.
Doesn't seem too complicated but the jury is still out on this one.
Have you seen my newest pictures ? Here's a link to frappr with some. I'm building the foam shape for my rear fairing now, and will start the front structure soon. I have designed the front so I can add a piece of 1 inch plexi if I ever get the bubble thing resolved.
Here's the link to my pictures.
Have you got any new pictures ?
Did you get the info about the concrete sub coming here from Will in Columbia ? Sounds really nice.
Good hearing from you again. Frank D.