Is the stencil a little stretchy?

It can be a little sticky. I thinik it depends on how hot the water is and how much time the stencil is underwater. I use my kitchen sink sprayer and a clean dishpan during the rinse stage

I'm looking to screen print my logo on boxes, sizes 4"x4"x4". 6"x4"x4", 6"x6"x4", and 8"x8"x4" will this work on it? how big are the sheets?

The sheets are like regular printer size 8 ½ x 11

can these be used with a laser printer?

How should I setup and print my artwork? The most important thing when setting up your artwork is to make sure it is 100% black. This will give you the best film positive when printing. Every printer is different, but if your printer allows you to adjust ink and paper settings, we recommend adjusting the ink setting on your printer to print in only black ink and adjusting the paper setting to glossy. This will give you the most density when printing. High density artwork that is 100% black will give you the best positive to block out the UV light. We use the Canon Pixma iX6820 with Arthur Imaging inks to print all our designs for our stencils. I saved my print settings as a preset to make printing each time a breeze. Check out this video to see my exact print settings that I use every time I make a stencil. Note for Inkjet Film: When printing on our Inkjet Printer Film, it is important that you print on the EMULSION side of the film. The emulsion side is the side that is NOT shiny (the side you can put your fingernail into). There is a special coating on the emulsion side of our Inkjet Printer Film that we add to our transparencies in order to increase the density of your final artwork and give you the best positive possible for creating your stencils. Reflecting/mirroring artwork is optional for inkjet printers, but recommended if your artwork is very detailed. >> Click here for our Inkjet Printer Tips Note for Laser Film: When using our Laser Printer Film you must reflect/mirror your artwork before printing. This ensures that the ink side of your laser film positive is touching the Ikonart Stencil Film when you expose. Laser film positives are not as dense as inkjet film positives, so reflecting/mirroring your art helps to give a better quality stencil. https://ikonartstencil.com/artwork-faq/

Could this be uses with etching cream instead of screen printing ink?

Absolutely :) Watch this video that shows the two working together . See link - https://youtu.be/9vt4ftd5Rwg When using Etchall with Ikonart Stencil Films, follow the directions on the bottle. Protect your work area. Clean surface to be etched. Apply stencil and rub down the edges to remove all air bubbles. Tape off the edges if needed. Apply a heavy coat of Etchall to open areas on stencil. Let the cream sit for 15 minutes. You can scrape off the excess cream and return to container for re-use, if desired. Flush etched surface with water to remove remaining cream before removing the stencil. After you etch, you can add a product like Rub n Buff or colored wax paste to your etched design for color. Storage: Store at 65-85F (18-30 C) in original container. Exposure to temperatures above 85F will cause cream discoloration, but will not affect cream usability or performance. Temperatures below 65F will produce crystals. If crystals are present, place closed container in warm water for several minutes, then stir until crystals dissolve.