does it work on cell phones ?

I used the permatex 81730 flowable silicone on a cracked screen on an ipad. The corner of the ipad had hit a hard surface and fractured the corner without interfering much with the rest of the screen. I thought I would try the flowable silicone and see how well it worked. I was mainly hoping to keep small pieces from slowly falling out and destabilizing the rest of the glass in the corner. The flowable silicone works as promised. When applied it flows out over the affected area much better than regular silicone. However, it doesn't permeate the crack and basically sits on top of the glass itself. In my experience it did stabilize the corner but left a raised place above the glass that obviously felt like silicone and eventually began peeling off. I eventually had to peel it off the surface of the glass and I haven't as yet replaced it. That's all the info I can share about it... but that was my experience.

can this be used to adhere the black strip to the front windshield?

100%. It gets messy on your hands but it will do its job. I did on my windshield which had a gap and the air was coming in while driving... After sealing it.... It is perfect.

Would this work on a car headlight housing to keep away moisture?

Yes it would as the silicone in it would prevent any water from getting in , also depends how big your Crack is .

Will this work for a glass door that has a small crack (about 2 inches)?

YES---but it will run down if not masked off. Not perfectly clear. Any run down or thick area can be trimmed/shaved off with razor. The crack needs some open space for the fluid to penetrate.

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🔧 Seal the deal with invisible strength!

WEATHERPROOF WARRIOR - Withstands extreme temperatures, shock, vibration, and harsh chemicals—ready for any environment.
DURABILITY THAT LASTS - Forms a flexible, long-lasting bond that adapts to surface irregularities without cracking or peeling.
COMPACT READY TO USE - Portable 42g tube designed for quick, mess-free application—perfect for on-the-go fixes.
PRECISION LEAK SEALING - Flows effortlessly into tiny cracks and hidden areas others can’t reach, stopping leaks before they start.
INVISIBLE ARMOR FOR YOUR GLASS - Creates a crystal-clear, tough waterproof seal that stays invisible but fiercely protective.

Permatex 81730 Flowable Silicone Windshield & Glass Sealer is a clear, durable silicone formula designed to seal leaks in hard-to-reach automotive and industrial areas. Resistant to extreme temperatures (-80°F to 400°F), weather, vibration, and chemicals, it forms a waterproof, flexible seal that fills surface voids for long-lasting protection.

Reviews

L**Y

Windscreen water seal

Dose exactly what it says on the box definitely stops leaks and hard to get places. Fantastic stuff easy to use definitely recommend.

14.06.2025

T**Y

Good product

Sealed my windscreen first time good product

19.05.2025

R**E

Excellent

This product solved my leaking windshield perfectly. Had been annoying me for a while but this did the trick in my case

16.10.2024

D**D

Not used

Gave 3 stars as was returned back for a refund as wasn't suitable.

6.05.2025

B**S

Value for money

Worked ok

19.05.2025

T**R

Good stuff

Did a great job of resealing the window on my Z4. No issues when applying it. Good bond.

30.08.2025

W**Y

Great seal, easy to use

Used for sealing windscreen

20.11.2023

S**P

Worked for 2 months, now leaks and the presence of this sealant isn't well received

61 plate Volvo xc60 with wet front passenger footwell. Took windscreen trim off and used two tubes around two sides and top of screen. V pleased, footwell then dry but after 2 months it’s v wet again. Took the car to two different specialist vehicle window fitters. Both said the same ‘worst decision you could have made using silicone’ Apparently silicone can etch into surfaces and unless it is completely removed by abrading off the top coat of paint and a specialist primer used, new bonding agent will not stick.Apparently the original screen bond was failing and now unsafe.Going to replace as not a lot more than refit, but costing more due my use of this sealant.

3.04.2024

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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Manufacturer	Permatex Products
Part number	81730
Item Weight	0.28 g
Product Dimensions	20.32 x 10.16 x 2.54 cm; 0.28 g
Item model number	81730
Colour	Clear
Style	Compact
Material	Silicone
Item Package Quantity	1
Special Features	Waterproof
Specific uses	Automotive, Industrial
Batteries included?	No
Batteries Required?	No

Permatex 81730 Flowable Silicone Windshield & Glass Sealer, Helps Seal Leaks in Hidden and Hard to reach Areas, Forms a tough waterproof durable clear seal 1 x 42g

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