Hupeyna HPFSJ100CA Transparent Waterproof Coating, 1 L

Transparent Waterproof: Hupeyna HPFSJ100CA is a clear, water-based liquid acrylic coating marketed for indoor and outdoor leak sealing. The listing says to apply 3–4 thick layers and estimates coverage at about 14 sq ft (1.3 sq m) per 1 kg, making it more suited to small repairs than broad-area coating.

At a glance

Water-based, transparent coating described for interior and exterior use.
Can be brushed, rolled, wiped, dipped or poured, according to the listing.
The listing estimates coverage of approximately 14 sq ft (1.3 sq m) per 1 kg and recommends 3–4 thick layers.
Recommended use temperature is 10˚C/50˚F or higher, including overnight temperatures.

Price

$26.99Save 16%

Reference price: ~~$31.99~~

Price checked: Nov 13, 2026

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Often bought together

Gorilla Waterproof Patch & Seal Spray, Flexible Rubberized Coating, Seals Out Water Air & Moisture, Stops & Prevents Leaks, Clear, 14oz/396g, (Pack of 1)

$17.97

Flex Seal – Stop Leaks Fast! Rubberized Waterproof Coating Spray, Ideal for Roofs, Holes, Cracks, DIY Projects, Automotive Fixes, Indoor & Outdoor Repairs, and More – Clear, 14 oz. (397 g) – 2 Pack

Pros and cons

Pros

Clear finish is intended to leave the underlying surface appearance visible.
Several application methods are listed, which can suit different repair areas.
Customer feedback describes good production quality and effective use on leaks.

Cons

One kilogram is listed to cover approximately 14 sq ft, and the recommended 3–4 thick layers limit how much area a container is suited to cover.

Technical specifications

14 specifications

Identity and size
Brand	Hupeyna
Model	HPFSJ100CA
Style / volume	1L / 33.8FL.OZ
Weight listed	1000 g
Pack quantity	1

Materials and protection
Material listed	Liquid acrylic coating
Water resistance listed	Waterproof
Form	Liquid
Colour	Transparent
Compatible materials	Acrylic, Stone, Wood
Recommended surfaces	Indoor and Outdoor

Application and coverage
Estimated coverage	approximately 14 sq ft (1.3 sq m)
Recommended coats	3-4 thick layers
Minimum use temperature	10˚C/50˚F or higher (including overnight temperatures)

What to know before buying

Listing details to confirm

The listing says to mix well before use, avoid dilution or mixing with other products, and apply when conditions are relatively dry. It states that thin areas may form a film within 24 hours while thicker areas may need 48–72 hours to fully cure, and wet or cold weather can extend curing. The listing also notes that surface impurities or very smooth surfaces may impair adhesion.

What’s in the box

Included

1 × 1 L waterproof coating, clear

Who is it for?

A good fit for

Small indoor or outdoor leak repairs where a transparent coating is desired.
DIY users treating listed compatible materials such as acrylic, stone or wood, with enough time for multiple coats and curing.

Less suited to

Large surfaces where the stated coverage of approximately 14 sq ft per 1 kg would require substantial product.
Projects that cannot be kept at or above 10˚C/50˚F, including overnight, or protected from wet conditions during application and curing.

Hupeyna HPFSJ100CA Transparent Waterproof Coating, 1 L · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 94 ratings

5 stars74%74%
4 stars11%11%
3 stars8%8%
2 stars3%3%
1 star4%4%

Customer feedback highlights perceived good production quality and says the coating works effectively on leaks and for its intended purpose. That is encouraging for the small repair use described, though these impressions do not establish results for every surface or application. The rating distribution is mostly five-star, with some lower ratings, so experiences are not uniform.

Positive themes

Feedback describes good production quality.
Feedback reports effective use on leaks.

Frequently asked questions

What surfaces does the listing say this coating is compatible with?

It lists acrylic, stone and wood as compatible materials, and describes use indoors and outdoors.

How much area does one kilogram cover?

The listing estimates approximately 14 sq ft (1.3 sq m) per 1 kg and recommends applying 3–4 thick layers.

What temperature and drying conditions are specified?

The stated minimum use temperature is 10˚C/50˚F or higher, including overnight temperatures. The listing recommends relatively dry, sunny conditions and says thick areas may take 48–72 hours to fully cure.

Does the package include an application brush?

The contents listing specifies one 1 L waterproof coating and says the brush is not included.