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.

Permatex PTX81730 Waterproof Floor Bull Silicone, Clear, 1.5 oz (42 g)

Permatex PTX81730 Waterproof Floor Bull Silicone, Clear, 1.5 oz (42 g)

Product ID: 728831795

Details

Brand
Permatex
Item Weight
0.01 Ounces
Item dimensions L x W x H
20.3 x 10.2 x
Material
Silicone
Style
Medium

⏳1 hr initial cure / 24 hr full cure

💧Excellent waterproof seal

🌡️-62°C to 204°C temp range

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Description

💧 Seal the deal with invisible, waterproof confidence!

CRYSTAL CLEAR FINISH - Transparent formula keeps your surfaces sleek and invisible
EFFORTLESS APPLICATION - Fluid liquid penetrates gaps quickly for a perfect seal
TRUSTED AUTOMOTIVE ESSENTIAL - Top-rated sealant for headlights, windows, and more
EXTREME TEMPERATURE RESILIENCE - Performs flawlessly from freezing cold to scorching heat
RAPID SEAL LASTING PROTECTION - Cures in just 1 hour to lock out leaks fast

Permatex PTX81730 is a transparent, waterproof silicone sealant designed for automotive use. It cures rapidly within 1 hour and withstands extreme temperatures from -62°C to 204°C, making it ideal for sealing headlights, windows, and other critical gaps. Its low viscosity ensures easy application and a flawless, invisible finish that protects against water intrusion and environmental damage.

Specifications

ASIN	B000BKEBO0
Amazon Bestseller	#108,276 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Window & Door Seal Lubricants
Brand	Permatex
Color	mulch
Customer Reviews	4.3 4.3 out of 5 stars (5,617)
Date First Available	August 7, 2012
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	20.3 x 10.2 x 2.5 cm
Item Weight	0.28 g
Item model number	81730
Manufacturer	パーマテックス(Permatex)
Model	PTX81730
OEM Part Number	81730
Product Dimensions	20.32 x 10.16 x 2.54 cm; 0.28 g
Special Features	Waterproof
Viscosity	Low
Warranty	Due to product defects

Reviews

A**R

My classic car had a pool of water in footwell after I forgot cover. I used this sealant around windscreen and waited for rain . Car now free of leaks , easy to apply and very effective.

13.10.2025

A**R

I received an opened item that was patched up with tape

26.01.2022

M**N

Jag tappade över till en spruta. Silikonen var lättjobbat och flöt ut bra. Jag kommer att beställa det på nytt.

10.11.2025

L**.

Silicone unico mai visto nella del genere

9.03.2026

M**A

As expected

24.01.2020

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€ 35.04

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In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

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