Weather sealing lexan windows

kolosy · 01-08-2025, 11:40 AM

I bought a set of rear windows from hard Motorsport. Thing I’m unclear on is since they’re one piece (e90 here, we’ve got the little fixed window behind the sliding one), the existing weatherstrip doesn’t work anymore. Did any of you work with these? Do you use windshield sealer? Or just don’t seal it and try not to get rained on?

mikerunt · 01-08-2025, 06:59 PM

Quote:

Originally Posted by kolosy

I bought a set of rear windows from hard Motorsport. Thing I’m unclear on is since they’re one piece (e90 here, we’ve got the little fixed window behind the sliding one), the existing weatherstrip doesn’t work anymore. Did any of you work with these? Do you use windshield sealer? Or just don’t seal it and try not to get rained on?

Mine don’t have seals and just use a little window sealant and hardware to keep in place. If there’s weather - I’m smoked no matter what because I have no front side windows.

kolosy · 01-08-2025, 07:06 PM

Any chance you can put up some pics of the mount points? The windows I got have nuts along the vertical divider, and then just two at the bottom. Nothing securing the front top corner.

omgzirra_exe · 01-08-2025, 07:45 PM

Quote:

Originally Posted by kolosy

I bought a set of rear windows from hard Motorsport. Thing I’m unclear on is since they’re one piece (e90 here, we’ve got the little fixed window behind the sliding one), the existing weatherstrip doesn’t work anymore. Did any of you work with these? Do you use windshield sealer? Or just don’t seal it and try not to get rained on?

DOW 795 sealant, instead of windshield sealant.

kolosy · 01-08-2025, 11:26 PM

Quote:

Originally Posted by omgzirra_exe

DOW 795 sealant, instead of windshield sealant.

What’s the difference?

omgzirra_exe · 01-09-2025, 10:19 AM

Quote:

Originally Posted by kolosy

What’s the difference?

this particular sealant was made for boats windows that use lexan

bigjae1976 · 01-10-2025, 09:44 PM

I was recently told that butyl tape works best with lexan.

01-08-2025, 11:40 AM	#1
kolosy BimmerPost Supporting Vendor 3485 Rep 3,629 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (3)	Weather sealing lexan windows I bought a set of rear windows from hard Motorsport. Thing I’m unclear on is since they’re one piece (e90 here, we’ve got the little fixed window behind the sliding one), the existing weatherstrip doesn’t work anymore. Did any of you work with these? Do you use windshield sealer? Or just don’t seal it and try not to get rained on? __________________ Current '20 AG X7M50 (daily + track tow), M4 GTS (track), '21 X3 M40i (wife) Recent Past '11 E90 M3 (track), '21 DG X5MC, '22 BG G82, '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 Cleaning out my garage -- stuff for sale
	Appreciate 0 Tweet Quote

01-08-2025, 07:06 PM	#3
kolosy BimmerPost Supporting Vendor 3485 Rep 3,629 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (3)	Any chance you can put up some pics of the mount points? The windows I got have nuts along the vertical divider, and then just two at the bottom. Nothing securing the front top corner. __________________ Current '20 AG X7M50 (daily + track tow), M4 GTS (track), '21 X3 M40i (wife) Recent Past '11 E90 M3 (track), '21 DG X5MC, '22 BG G82, '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 Cleaning out my garage -- stuff for sale
	Appreciate 0 Quote

01-10-2025, 09:44 PM	#7
bigjae1976 Major General 2013 Rep 8,248 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [6.33] 2011 BMW E90 M3 [6.83] 2013 BMW 328i [6.67]	I was recently told that butyl tape works best with lexan. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
	Appreciate 1 kolosy3484.50 Quote