Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


700 posts

Ultimate Geek

# 236396 31-May-2018 11:55
Send private message

We are looking at flyscreens that will fit on the outside of white uPVC windows.  The least impact would be flexible screens with a 12mm(ish) wide magnetic strip that is permanently glued to the window frame.  The problem is that the magnetic strip is black, and the suppliers don't want to commit to painting it to match the window frames. The screens would probably stay on all year anyway, but it would be nice to have the option to remove them without leaving an ugly black strip.


I can't think of a reason why a thin coat of paint would have a detrimental effect on the magnetic strength of the strip.  I'd 'maybe' be reluctant to run wet & dry up the strip (to give the paint a key) with vague thoughts of stroking magnets and hitting them on the end with a hammer, but paint...  I can't see it. To be fair, I suppose I would absolutely need to use an etching primer as well, but the total thickness would still be bugger all.


The suppliers are letting us have a spare length of the magnetic strip to experiment with, but it would be great to hear the thoughts or experiences you guys have (on the subject — the random thoughts of the average Geekzone Netizen are too scary to contemplate). wink





Trevor Dennis
Rapaura (near Blenheim)

Create new topic


2355 posts

Uber Geek


  # 2026156 31-May-2018 12:13
Send private message

Strip magnets have multiple poles along their length. You will struggle to demagnetise them hitting them/stroking them. It's most likely iron powder embedded in rubber. No idea how you'd prime that "properly" but I'd probably experiment with a standard acrylic undercoat to start if you were going down that route.


Magnetism falls away sharply with distance (inverse square law, I think). Very different application, but I painted a door with Resene's magnetic paint. It's just paint with iron powder again. It was nice and magnetic bare, but by the time I'd undercoated and two top coats, it was noticeably less magnetic with the same magnets. I guess you're not aiming to actually hold anything heavy up though, just attached.


As a randomish hypothesis though, but I believe at least some uPVC windows have steel reinforcing in the frame. Have you tried holding a magnet to your existing window frames? You might be able to glue the strip to the screen rather than the other way around.



8807 posts

Uber Geek

  # 2026159 31-May-2018 12:19
Send private message

That strip is usually ferrite powder extruded in plasticised PVC.  EPL in Chch used to make it - not sure if they still do.  You'd be facing the same problem as painting other flexible plasticised PVC - the paint will flake or peel off either because it's not as flexible as the substrate, or there are co-extrusion waxes and plasticisers in the compound that will interfere with adhesion.


I think this stuff might be your best bet - probably available from supercheap etc:


I'm guessing you might also need some strong solvent to clean the surface thoroughly possibly acetone or MEK would do the trick.


White electrical insulation tape might also work - for a while anyway - until the plasticisers probably leach out and start dissolving the glue.


Edit - forget the insulation tape for outdoor use.


That vinyl paint is available from Supercheap at $20/can.


I recommend that you don't expect that as it's got "adhesion promoter" you can avoid having to clean it down with solvent first. That might be okay with aged vinyl, but I'd be surprised if new extruded flexible PVC didn't have quite a waxy surface.


It states for interior use.  PVC polymers aren't inherently UV resistant, but it'll probably be okay for quite a while.





700 posts

Ultimate Geek

  # 2026415 31-May-2018 17:44
Send private message

I loved the idea of reversing the magnet.  That was excellent lateral thinking.  Unfortunately, I have tried, and magnets do not stick to the window frame, so any ferrous content is either too little and/or too deep.  I'll pick up the length of magnetic strip tomorrow, and try some of the suggested paints.

Trevor Dennis
Rapaura (near Blenheim)

8807 posts

Uber Geek

  # 2026429 31-May-2018 18:19
Send private message

That actually reminded me - I'd been to a hardware store as I wanted to try some white vinyl paint on the padded vinyl tops of some vintage bar stools we've got, I'd asked about it at a local M10 Mega hardware store - they looked at me blankly and said they'd never heard of it.


So I stopped in at Supercheap Auto this afternoon, picked up a can, painted the vinyl on the bar-stools (they were kind of poo brown).  Needed three coats to cover - they're back inside and look great.  Dries fast even though it was quite cold today in the garage where I painted them. My wife thought I'd recovered them.  It seems to work well - time will tell if it lasts, but it should probably be okay.



Create new topic

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Chorus to launch Hyperfibre service
Posted 18-Nov-2019 15:00

Microsoft launches first Experience Center worldwide for Asia Pacific in Singapore
Posted 13-Nov-2019 13:08

Disney+ comes to LG Smart TVs
Posted 13-Nov-2019 12:55

Spark launches new wireless broadband "Unplan Metro"
Posted 11-Nov-2019 08:19

Malwarebytes overhauls flagship product with new UI, faster engine and lighter footprint
Posted 6-Nov-2019 11:48

CarbonClick launches into Digital Marketplaces
Posted 6-Nov-2019 11:42

Kordia offers Microsoft Azure Peering Service
Posted 6-Nov-2019 11:41

Spark 5G live on Auckland Harbour for Emirates Team New Zealand
Posted 4-Nov-2019 17:30

BNZ and Vodafone partner to boost NZ Tech for SME
Posted 31-Oct-2019 17:14

Nokia 7.2 available in New Zealand
Posted 31-Oct-2019 16:24

2talk launches Microsoft Teams Direct Routing product
Posted 29-Oct-2019 10:35

New Breast Cancer Foundation app puts power in Kiwi women's hands
Posted 25-Oct-2019 16:13

OPPO Reno2 Series lands, alongside hybrid noise-cancelling Wireless Headphones
Posted 24-Oct-2019 15:32

Waikato Data Scientists awarded $13 million from the Government
Posted 24-Oct-2019 15:27

D-Link launches Wave 2 Unified Access Points
Posted 24-Oct-2019 15:07

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.