Types of waterproof sprays and how to use them | How to choose one for leather and fabric, how to spray safely and how to prevent mistakes

I bought a spray in case it rains, but I sometimes wonder if I can use the same thing on both leather and canvas, and how long I should let it dry. Even though the name "waterproof" is the same, the target materials and usage differ depending on the product.

When choosing, check the labeling of the product you want to use first, rather than looking at the reputation of the ingredients. Only when you have the material of the bag, the purpose of the spray, and the area where it will be sprayed will it be ready for safe use.

What waterproof sprays can and cannot do

Many waterproofing sprays apply a treatment to the surface of the material that makes it easier to repel water. Sprayed bags are not completely waterproof, as there is a difference between allowing water droplets to roll off the surface and not letting water pass through the seams and zippers.

If you're going to use it on a rainy day, it's a good idea to consider an umbrella, a bag cover, and an inner bag for things you don't want to get wet. This product is not intended to repair existing stains or scratches, so please do not try to cover up the stain by spraying it over it.

When choosing the type, read down to ``what it can be used for'' and choose the type.

There are fluorine-based products, silicone-based products, and combinations of both on the market, but you cannot determine compatibility with leather based on the ingredient name alone. Since solvents, formulations, and target finishes are also involved, we will read from broad categories such as "for genuine leather" and "for shoes" to materials that cannot be used. [2]

For example, if you have a cloth bag with a leather handle, it may not be sufficient to choose a spray that only fits the bag itself. Avoid spraying the lining and metal fittings all at once, and check the instructions for both the bag and care products.

Be sure to use it outdoors with good ventilation.

The Consumer Affairs Agency warns against accidents caused by inhaling waterproof spray mist. It is advised to wear a mask and use it outdoors, check the wind direction and people around you, avoid spraying near your face, and avoid using large amounts at once. [1]

Don't think that just opening the front door is enough, or that opening the window inside the car is enough. Avoid indoors and small spaces, ensure that children and other people do not come close to the fog, and follow the warning signs on the can regarding fire.

Masks are not a substitute for outdoor use. If you inhale it, symptoms may be delayed, so please consult a medical institution or Japan Poison Information Center as soon as possible. [1]

How to use: Try it out, apply a thin layer, and let it dry.

First, check the labeling on the bag and can side by side.

First, check the materials that cannot be used, spray distance, amount used, and drying method. Remove dust from the bag, and if it is wet, do not start working on it, and prepare it to the condition specified by the product.

Try it out in an inconspicuous place, then look at the color and texture after it dries to make a judgment. If you only spray the product immediately after spraying, you may miss any changes in the stain or texture. [2]

Adjust the distance and drying time to the one you are currently using.

In the care guide for Coronil's waterproof spray, there are instructions to spray evenly from a distance of about 20 cm. However, this number is an example of the company's guidance and does not apply uniformly to other products. [3]

Concentrate on one area and do not apply so much that it gets wet, and follow the product label for the amount and number of times. To speed up drying, avoid placing your hair near a hair dryer or heater, and if you are instructed to finish wiping or brushing, do so after it has dried.

Do not overlap when it becomes white or stained.

If whiteness or discoloration appears after spraying, it is important not to rush to fix it with additional sprays, oils, or alcohol. It will be easier to report the situation to the vendor if you record what you used and where, and if you know the name of the can and the material of the bag, then contact the vendor.

Methods that involve scraping the surface or applying heat can change not only the appearance but also the finish itself. Before adding waterproofing to damaged items, check to see if they are in need of repair in the first place.

Frequently asked questions

Should I always use a new product?

Not necessarily required. Some products already have treatments or finishes that do not recommend spraying, so please prioritize the care instructions from the place of purchase.

Do I need to put it on before going out every time?

Rather than stacking at a fixed frequency, look at the instructions on the supplies and the condition of the surface. Don't think that if you apply a large amount, the performance will last longer.

Can I use it while it is wet in the rain?

Do not use it as a temporary measure against rain, but first protect the bag from rain and remove moisture. Whether or not it can be used on wet materials varies depending on the product.

Can waterproofing spray also stop color transfer?

The treatment to repel water and the treatment to suppress the movement of dyes and pigments are different. Do not expect any effect from products that do not clearly state that they prevent color transfer.

Are “natural ingredients” and “fluoride-free” safe?

You cannot judge from the label alone that it is safe to inhale or that it can be used on any leather. Read the characteristics of the formulation and precautions when using it separately.

Do I need a rain bag as long as I have a spray?

It depends on the usage environment. On days when it rains for long periods of time or when you have work tools to keep dry, consider the structure and inner bag to prevent water from entering, regardless of your preference for the exterior appearance.

When choosing a bag, consider the material and the day it will be used.

Don't limit your rain protection to just care products, try choosing from your usual baggage and how you carry it. The two product numbers introduced here are candidates for different usage, and are not introductions that guarantee compatibility with specific waterproof sprays.

A canvas briefcase to keep your work tools separate.

crazy horse leather Waterproof canvas shoulder bag_E

A model with a waxed canvas body and a cowhide handle. There is a partition for a PC and an external zipper pocket, making it suitable for those who want to create a fixed place for documents and small items.

Product information: Approximately 41 x 10 x 30 cm, approximately 1.3 kg. When storing your PC, check the actual size of the main unit, and on rainy days, protect electronic devices with an inner bag etc.

View product details

Mini shoulder bag for holidays when you need to pack your bags.

Crazy horse leather mini shoulder bag_T

Compact shoulder bag with magnetic flap. As a candidate for days when you want to go out without carrying a large bag, you can choose according to the size of your wallet or smartphone.

Approximately 20 x 15 x 6.5cm. Since it is not a completely waterproof bag, it is important to use it to avoid rain and to care for it according to the material.

View product details

When using waterproof spray, start by reading the label.

The important thing is to use the right one that matches the material rather than choosing one that looks strong. Check suitability, use only the necessary amount outdoors, and dry as directed, while also making sure to protect the bag from rain.