Creating a diy polymer lens filter for the solar eclipse and I want to make sure I'm not damaging my dslr light sensor

Question:
I was wondering if using this film would I need to use a certain f/stop or ISO to ensure the sensor is not damaged while shooting. Would simply using this film would prevent this from happening?

Details:
Recently bought a Nikon D3300, this would be my first time owning a DSLR. I have taken classes during high school and I know how to use and take care of a camera (no concern there).

There's a solar eclipse happening this weekend and I want to be able to take images of the event. I understand that you can damage the light sensor inside the camera if pointed directly at the sun. I have seen lens that you can use and apply, but unfortunately would not deliver in time for my trip ( poor planing/ buying the camera was unexpected and not originally intended for this). My friend purchased this polymer film (he gave me the link below) that is suppose to be used for telescopes and was kind enough to give me some.

This would be my first time attempting to take pictures of the sun and would like to preserve the quality of this camera to the best of my ability.

I'm typically resourceful when researching this information online but l was unable to find specifics to ease my concern. Any personal experience / feedback would be appreciated.

Thank you in advance!

eBay link for polymer sheet being used:
http://m.ebay.com/...mwBanner=1

Sun / moon only? If so, why not just tape one of the $4 type eclipse glasses filters over the camera lens?

Or a wider shot of the scene?