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Old 29-11-2020, 06:41   #1
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Exterior plastic window film for solar heat control

I have a late model Jeanneau sailboat in South Florida with a window in the cabin house that will be rebedded. To reduce thermal eyxpansion of the window I want to put some type of sun blocking solution in place. Yes, I can use phifertex or similar but with so many different types of window films it seems to be an easier fix to place a film over the outside and just redirect the sunlight.

I am aware of film adhesive outgassing issue on plastic so it needs to be a film built to manage this.

Ideas?
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Old 29-11-2020, 08:13   #2
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Re: Exterior plastic window film for solar heat control

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I have a late model Jeanneau sailboat in South Florida with a window in the cabin house that will be rebedded. To reduce thermal eyxpansion of the window I want to put some type of sun blocking solution in place. Yes, I can use phifertex or similar but with so many different types of window films it seems to be an easier fix to place a film over the outside and just redirect the sunlight.

I am aware of film adhesive outgassing issue on plastic so it needs to be a film built to manage this.

Ideas?

In fact I just put some samples on spare hatches and left them on the roof to age. There are products marketed specifically for plastic glazing, but they are not available in small quantities.


One product I am looking at is marketed for tinting taillights (which sounds stupid to me, but let's skip that), which are generally a type of acrylic. They looked factory tinted, but time will tell on durability.


Most films are a non-stretch polyester. The taillight film appears to be polyurethane, like helicopter tape. I'm sure there are differences in weathering and gas permeation. And then there is the question of removal.
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Old 29-11-2020, 09:09   #3
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Re: Exterior plastic window film for solar heat control

Interesting.

Would be great to see your test results.
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Old 02-12-2020, 08:45   #4
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Re: Exterior plastic window film for solar heat control

I think that I would start with the cheapest and easiest solution, and move to the others when it fails. You can pick up some automoboile tenting plastic at your local auto parts store, in any of several percentages of darkening, and go from there. I doubt that it will damage the glazing, but if in doubt, cover a tiny corner or part of the overlap, and wait a few weeks.
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Old 03-12-2020, 07:05   #5
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Re: Exterior plastic window film for solar heat control

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I think that I would start with the cheapest and easiest solution, and move to the others when it fails. You can pick up some automoboile tenting plastic at your local auto parts store, in any of several percentages of darkening, and go from there. I doubt that it will damage the glazing, but if in doubt, cover a tiny corner or part of the overlap, and wait a few weeks.
Good feedback. I did get a piece of static cling film to test and it failed. My logic is to exterior apply film so as to not let sunlight transmission occur by reflecting that energy out before it goes through the thickness of the window.
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Old 04-12-2020, 07:27   #6
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Re: Exterior plastic window film for solar heat control

"Static cling" is not the right stuff. Usual window tinting film glues itself on. However, in usual practice it goes on the inside of the window, out of the weather but allowing light to travel through the glass. I'm not at all sure that it will hold up on the outside.
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Old 04-12-2020, 07:37   #7
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Re: Exterior plastic window film for solar heat control

It is a bit surprising to me that there is not more knowledge on this subject than what I've found so far. A film applied to the outside of a plastic window that redirects solar energy and has an adhesive that will not wreck the plastic seems like a no brainer.

Where are all the smart people with experience?
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Old 04-12-2020, 07:39   #8
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Re: Exterior plastic window film for solar heat control

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Good feedback. I did get a piece of static cling film to test and it failed. My logic is to exterior apply film so as to not let sunlight transmission occur by reflecting that energy out before it goes through the thickness of the window.

Please explain "failed." Came off? Bubbles?
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Old 05-12-2020, 06:34   #9
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Re: Exterior plastic window film for solar heat control

Failed to adhere to the outside window.

So, any film solution needs to have an adhesive that won't create any outgas issue with the PMMA (acrylic.) window itself.
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Old 05-12-2020, 06:48   #10
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Re: Exterior plastic window film for solar heat control

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In fact I just put some samples on spare hatches and left them on the roof to age. There are products marketed specifically for plastic glazing, but they are not available in small quantities..
What time period will you observe before you evaluate results?
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