Does this also work on my iphone

Only if you glue the iPhone to the windshield of your car first.

This thing just fills the resin to make the crack less visible, am I correct? It doesn't really prevent the crack to run any further, right?

Incorrect. It actually does help prevent the spreading of the cracks (depending on the size of the damage). If the damage is contained within the circular area of the applicator tool, you should be good to go. But if the damage extends beyond the boundry of the applicator, extra steps or applications could be needed. This resin works especially well to prevent further spidering due to extreme temperature changes.

Can this product be used on a house window?

As an addendum to my answer, I want to add the fact that windshield repair resins come in various viscosities. The #25 resin is a good, all around viscosity, but the higher the #, the less visible the crack will be after the repair, but the more difficult it will be to introduce the resin into the crack. As a rule of thumb, the thicker densities should only be used on hot days when their viscosity is reduced. What I would do is first try using a higher viscosity resin for a crack, like 50 for example. I would continue using it as long as it flowed evenly into the crack, but when I reached a point where the crack was so narrow that 50 stopped filling the crack entirely, I would switch over to 25, and sometimes even thinner on cold days. Getting at least some resin into the crack is better than not getting any at all.

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Permatex 09103フロントガラス修理キット

Product ID: 727082758

Details

Brand
Permatex
Specific Uses For Product
Automotive
Material
Plastic
Compatible Material
Laminated
Item Form
Product

🚗Compact, travel-friendly kit

⏱️Quick DIY windshield fix

🛠️7.1 oz precision resin

S$37

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fix chips like a pro—because your ride deserves flawless views!

COMPACT PORTABLE - Lightweight 0.28g kit fits easily in your glove box
PRECISION RESIN FORMULA - Engineered 7.1 oz resin for seamless chip repair
TRUSTED BRAND RELIABILITY - Permatex quality with over 12,600 satisfied users
DIY WINDSHIELD RESTORATION - Restore clarity and strength without costly shop visits
TOP RANKED AUTO REPAIR TOOL - Ranked #71 in Amazon Japan’s car window tools

The Permatex 09103 Windshield Repair Kit offers a 7.1-ounce precision resin solution designed for quick, effective DIY chip repairs. Compact and lightweight, this trusted kit ranks among the top windshield repair tools on Amazon Japan, empowering drivers to maintain crystal-clear windshields without expensive professional service.

Specifications

ASIN	B000ALJ4MY
Amazon 売れ筋ランキング	車＆バイク - 34,300位 ( 車＆バイクの売れ筋ランキングを見る ) カーウィンドウ用ツール - 90位
Amazon.co.jp での取り扱い開始日	2013/9/15
おすすめ度	4.0 5つ星のうち4.0 (12,733) var
ブランド	Permatex
メーカー	Permatex
メーカーにより製造中止になりました	いいえ
モデル名	09103
位置	前
商品の寸法奥行き × 幅 × 高さ	32 x 172 x 87 mm
商品の重量	0.28 g
商品モデル番号	9103
外装状況	ラミネート
純正品番	09103
色	色なし。
製品サイズ	3.18 x 17.25 x 8.69 cm; 0.28 g
電池	1 不明電池

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