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Read here until you're tired of reading:
http://modelrocketbuilding.blogspot.com/search?q=spirals
I used this my first time filling spirals without any problem:
https://www.lowes.com/pd/3M-Patch-Plus-Primer-8-fl-oz-White-Patching-Compound/3851673
Just had to get the water mix right. Estes tubing.
http://modelrocketbuilding.blogspot.com/search?q=spirals
I used this my first time filling spirals without any problem:
https://www.lowes.com/pd/3M-Patch-Plus-Primer-8-fl-oz-White-Patching-Compound/3851673
Just had to get the water mix right. Estes tubing.