About Us

Prüfengel offers authentic consumer tests in which real users share their experiences with products. Our tests are based on practical applications in everyday life and reflect the opinions of consumers. As we focus on consumer tests, we do not carry out material, long-term or laboratory tests. Our aim is to provide honest feedback to help you make a purchasing decision. For a detailed insight into our comprehensive evaluation process, which forms the basis of all our product reviews, please click here.

WindowShield
Sun protection film

The WindowShield sun protection film made a good impression in our test. In addition to the high-quality visual impression, the product impresses with its functional design. The material is well processed and has no unclean edges or creases. Only the rolled delivery makes handling more difficult , but at the same time proves to be useful for safe transportation. The equipment supplied and the self-adhesive backing make it easy to attach. Fitting alone requires a little patience, which is why we recommend a second helping hand. The sun protection film promises heat insulation in summer, heat retention in winter, privacy protection during the day and protection from UV radiation. If the customer is not satisfied with the product, they can contact the German family business at any time to solve the problem.

Advantages

✅ Heat-regulating and UV protection
✅ Self-adhesive
✅ Can be installed indoors and outdoors
✅ Extensive range of accessories
✅ residue-free removal
✅ German family business

Disadvantages

❌ Patience required for installation

The first impression

Packaging and labeling

ℹ️ Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be ensured.

CriterionRemarkScore achieved*
Product protectionCarton is sturdy, product sufficiently protected100 points
Sustainability PackagingNo unnecessary packaging waste, only plastic cap90 points
OtherHigh-quality packaging ideal for sun protection film100 points
Total97 points
Weighting: 10%
*The maximum score is 100 points
Sonnenschutzfolie Verpackung
Sun protection film
Packaging

The WindowShield sun protection film arrived for our test in the typical Amazon shipping box. This was undamaged on arrival and could be easily opened by removing the adhesive strip. The product box contained the rolled-up film in a round, sturdy cardboard shipping tube. This packaging method provides the product with optimum protection against external influences. As a result, product protection was fully guaranteed and the sun protection film was delivered in perfect condition .
The packaging is partially recyclable. However, the cap cannot be recycled. Notwithstanding this, the presentation of the product makes a very good impression.

After unpacking

Package contents and instructions

ℹ️ Most people’s first impression after unpacking is immediately memorable. Are the contents of the package complete and does the manufacturer make it as easy as possible for me to use the product straight away?

CriterionRemarkScore achieved*
Package contents & scopeSun protection film incl. squeegee, cutter knife and instructions for use100 points
Instructions for useIn German and English, illustrated, clearly written95 points
Contact informationCan be found on the box and the instructions100 points
Total98 points
Weighting: 10%
*The maximum score is 100 points

The mailing envelope contained the sun protection film including squeegee with felt layer, cutter knife and instructions. The application of the film is clearly described to the customer in German and English with illustrations and small texts. The contact information , including telephone number and email address, can also be found in the instructions and on the shipping sleeve. All in all, this is an exceptionally well thought-out way of shipping a product.

The first time in your hand

Product processing and appearance

ℹ️ Before we start the practical test, we take a close look at the product processing. How high quality are the materials used? Is the look and feel satisfactory?

CriterionRemarkScore achieved*
Visual appearanceVery good visual appearance100 points
ProcessingVery good workmanship100 points
StabilityTear-resistant, rolled up90 points
Sustainability of the productNo information on sustainability, but residue-free removal possible80 points
Total93 points
Weighting: 20%
*The maximum score is 100 points
Sonnenschutzfolie Nahaufnahme
Sun protection film
Close-up

First of all, it should be mentioned that the sun protection film makes a very good visual impression. We did not notice any processing errors, unclean edges or creases. The product also impresses with its functional design. The tools included are also of high quality. Only the rolled delivery makes handling more difficult, as the material initially wants to retain its original state during installation. The problem is solved on first contact with the window.
There is no information on the sustainability of the product. The manufacturer merely points out that the sun protection film can be easily removed if necessary. Due to the high-quality materials and excellent workmanship, we assume that the product will have a long service life. In addition, customers can contact the German family business at any time if they have any queries.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ Our practical test is the most relevant and therefore the most important. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

CriterionRemarkScore achieved*
AssemblyPossible alone, recommended for two80 points
LiabilityVery good adhesion, self-adhesive90 points
FunctionalityMultifunctional: heat control, reduced light irradiation, UV protection, privacy protection during the day100 points
VariantsVarious sizes90 points
Total90 points
Weighting: 40%
*The maximum score is 100 points

The WindowShield sun protection film generally surprised us in a positive way. The equipment supplied, especially the high-quality squeegee with felt layer, was very useful and theclear installation instructions helped us to apply the film to the window. In contrast to the manufacturer’s other window films, there were no markings to cut the film precisely to size, which is why we used a ruler to help us. The self-adhesive backing in combination with plenty of lye water adhered very well to the window at the first attempt. Any air bubbles could then be smoothed out with the squeegee. Nevertheless, it should be mentioned that mounting alone requires some patience and is much easier with two people. Especially as this avoids the possibility of the back sticking.

Overall, the sun protection film offers good privacy protection during the day thanks to the reflective coating, without noticeably darkening the room. In our test, we also noticed that our bay window heated up considerably less. How the UV and heat protection behaves in summer would have to be determined in a long-term test.
The tested model in the size 44.5 x 200 cm is also available in 60, 90, 119, 149 x 200 cm and 44.5, 60, 90 x 400 cm.

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we look at how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also examine consumer ratings and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratioGood85 points
Rating cut4.2 out of 5.0 on Amazon60 points
Total73 points
Weighting: 20%
*The maximum score is 100 points

On the Amazon platform, consumers have given the product an average rating of 4.2 stars. Some complain that the sun protection film evaporates very much and that the cooling effect is just one degree. In contrast, other reviewers praise the heat protection and the high quality. Almost all reviews recommend installation with a lot of patience and a helping hand. In our practical test, we can confirm that a second person is recommended during installation. We also noticed a heat-protective effect. In order to be able to make a more precise statement here, a practical test over a longer period of time would be necessary.

Prices of up to €25 are charged on the internet for equivalent products. Very inexpensive products, on the other hand, are available for as little as €10. The WindowShield sun protection film is therefore in the middle price segment with a current price of €19.95. Consequently, the price ratio is good for the quality and scope of services you receive.

Overall result

WeightingScore achieved*
1. packaging & labeling10%97 points
2. package contents & instructions10%98 points
3. product processing & appearance20%93 points
4. in the practical test40%90 points
5. price/performance & consumer ratings20%73 points
Total89 points
*The maximum score is 100 points
Sun protection film
of the brand
WindowShield
achieved
89
Points in our test and therefore passed. The test was carried out in the test period
01/23
and is stored in our database under the licence number
230116001
. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

The practical tests are based on careful observation and do not include long-term or laboratory tests. The test ratings reflect the opinion of our experts and are based on careful analysis. We would like to emphasize that these evaluations do not claim to be exhaustive and reflect both subjective and objective impressions. The assessments are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a reputable and thorough testing process, which has been developed in a long and professional process in close cooperation with our experts.

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Evaluation process

You can find a detailed insight into our evaluation process, which forms the basis for our product ratings, here:

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Our product evaluations are carried out exclusively through direct, on-site tests. This ensures a detailed and specific examination of the product properties. You can find more information about the test procedure here.

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