Hello!
The great thing about solar observing is never, never cut corners and try to cheap out. Permanent damage may occur instantly if any of your equipment is insufficient or fails while observing.
If you're going to do solar, then I strongly suggest use well established equipment of good repute.
The Baader Solar film is designed for single film use, as far as I know. They even have (relatively) cheap mounted films in a simple cell for various apertures or you can buy a roll of film for much cheaper, per unit area. If you do that though, you must ensure that the film is very securely affixed to the FRONT END of your telescope. Failure to do so may result in permanent blindness if the film falls off or otherwise fails while you are observing the sun.
Do not use "Sun X", "V Cool" or any other form of solar film not explicitly designed for solar observation. Firstly even if you stack multiple films to make the sun dim enough to comfortably observe, unless you are very sure of the IR and UV transmission (despite what the manufacturer says), these invisible wavelengths can still burn your retina. The first sign of trouble you'll see is a permanent imprint of the sun in your visual field. Not pleasant.
Popular manufacturers of white light solar filters are Baader and Thousand Oaks.
This item is designed for binocular use, I believe.
Also, never, never use rear or eyepiece mounted solar filters without front protection because these filters will take the full brunt of focused solar energy and will fail. In the past cheap "solar eyepieces" were sold and they had the unnerving tendency to crack under the heat stress. Instant failure = instant blindness. There are however high end viewing devices intended to be affixed to the rear of a telescope. Examples of such rear mounted viewing aids include
Herschel Wedges and
Daystar H-Alpha filters. Even then, you'll find strict guidelines on the use of energy rejection filters based of telescope design and aperture for these items. There are, however, not designed for binocular use.
A note about H-Alpha observing: Dedicated solar H-Alpha filters are much more expensive than the equivalent night time H-Alpha filters used for narrowband astrophotography. This is because a solar H-Alpha filter has a bandpass an orders of magnitude smaller than the night filter, in order to safely permit viewing. Using a nighttime filter will be dangerous to your eyes so do not do it!
Solar observing is lots of fun because the sun is a dynamic object. Only thing is its a very, very hot hobby so bring a big water bottle! Oh, and if you're using binos, make sure the eyeguards completely shade your eyes so you don't inadvertently stare at the sun. Most of us use a telescope (be it a front filtered telescope or a dedicated solar scope) with a diagonal so that our eyes look 90° away from the sun
All the best!
