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RECYCLE COROPLAST! Coroplast is common and inexpensive plastic material. Many illegal signs on the roadside use this material. So, help your self, pull up these illegal signs, do your county government, and neighborhood a favor, and give yourself FREE FIN material. After election time, go out that night, or next day, and harvest hundreds of these signs and do everyone a favor. RECYCLE COROPLAST, and blast it into the sky.
To the left, is a photo. This is a water rocket with three coroplast fins. The FIN assembly and NOSE assembly is actually slide onto a sleeve, made from a "larger" soda bottle. The bottom of this sleeve has been curled with heat.
The coloplast fins are attached with PL Roof and Flashing cement. This glue is very flexable and sticks very well to PETE and coroplast. Actually, any of the FLEXIBLE type PL adhesives will work great, but not PL Premium construction adhesive.
DO NOT sand the surface of coroplast, it is already treated with adhesive treatment. Sanding will result in POOR adhesive, just the opposite you would expect from the extra work from sanding.
You can print a template of coloplast fins on sample to left. You can use Adobe Acrobat to print to full scale on most any computer or printer. Download - coroplast_fin.pdf
If you want foam fin template, I added one here. However, because of size limits of 10.14 inch in Acrobat, you will have to estimate the bottom of the fin. Download - foam_fin.pdf