General window & fitting FAQ

Are your windows pre-cut to fit?

YES – all our windows are trimmed to the size of the stock windows so you don’t need to start cutting or trimming for them to fit. However, there are a few exceptions where we deliberately make the windows a little bigger in order to fit where body trims are bonded to the glass or fitment of the window would depend on how you want to fit them so we just add a little extra to be trimmed of by you.

If your original windows fitted into the rubber gaskets or frames then our windows will fit like this.

If your windows are bonded to the vehicle like most modern cars then our windows will bond to the vehicle.

**None of our windows come with the encapsulated rubber trim or fitting clips that you get on OEM glass windows**

We do not produce the windows oversize so if you wish to have something custom sized please ask before ordering.

Please remember our windows are designed for motorsport applications and not to be a direct window replacement on a road vehicle where you require all the trims and seals.

Are your windows road legal?

Windscreens are generally NOT road legal in any country

UK -  Side and rear windows are legal in the UK as retro fit items, Vehicles undergoing IVA testing may require an E-Marked window.

Other countries - There are many different rules which we can not advise on so please check with your own countries regulations.

TUV approval - For TUV approval the vehicle with windows installed MUST be presented at the TUV test station  - Please ask for more information

My glass windows have black borders, do yours?

YES – if there’s a black border on the stock glass we put one on the Polycarbonate, and usually you will see we put the dot matrix on and any other detail just to make the windows look sweet.

Can I fit the door windows to the electric motors?

YES – as our windows are direct replacements for the glass they will fit to the electric or manual winder mechanisms, however we recommend you choose the hardcoated polycarbonate as regular polycarbonate will scratch very easily. They don’t come with any of the window fitting tabs or fixings though.

How do your windows fit?

There are 2 ways that windows are usually fitted to cars:

If your original windows fitted into the rubber gaskets or frames then our windows will fit like this.

If your windows are bonded to the vehicle like most modern cars then our windows will bond to the vehicle.

**None of our windows come with the encapsulated rubber trim or fitting clips that you get on OEM glass windows**

For our rear screens and quarter windows, we have produced an instructional video that you can watch here.

For door windows, Youtuber Maxwell Millz has produced a helpful video giving you some pointers and tips on how best to install our windows that you can watch here.

We do not produce the windows oversize so if you wish to have something custom sized please ask before ordering.

Please remember our windows are designed for motorsport applications and not to be a direct window replacement on a road vehicle where you require all the trims and seals.

How do I stick your windows in?

IMPORTANT – Do not be tempted to use any glues or primers that are designed to bond glass windows into cars. These primers and cleaners are too aggressive for polycarbonate, and the typical glass adhesive does not allow for expansion in the polycarbonate. These will damage your windows.

Use our PolyBond-PC adhesive -or an alternative high elastic urethane adhesive- and there is no need to add any additional primer to the polycarbonate.

TIP – Don’t let your windscreen fitter try to tell you any different!

Glass adhesive does not allow the polycarbonate window to expand and will either rip of the print or primer with the damage that you can see 

My doors are frameless, how do I fit the windows?

Frameless door windows suffer from flexing at the top and rear side (B pillar), so really you need to add our rolled alloy stiffening plates which fit to the back edge of the windows and allow you to add fixings into the metal work of the door.  

TIP – if you want to roll the windows up and down, we recommend choosing 5mm thick ‘hardcoated’ polycarbonate without the stiffener plates. If you are fixing the windows solid you can go for a thinner polycarbonate 4mm with the additional stiffener plates.

How can I clean your windows?

For all of our windows except windscreens, Just use our POLYPOLISH window care kit.