Ready to apply corrosion protection to some pieces...Cortec data sheet states "dilute 10-20%" for brush application.

My survey question - am I thinking correctly - mix a ratio of two parts water to 8 parts Cortec?


Views: 474

Reply to This

Replies to This Discussion

Use denatured alcohol instead of water. It dries much quicker. You can literally save this solution in a jar for easy future use.

I "think" Caleb told me I could dilute it to whatever consistency necessary that it spread nicely - I'd say that ratio sounds about right. I bought some of those small plastic lab sample jars (the ones they give you to leave a sample in the bathroom for your medical!) on Ebay and would mix small batches, cap and store, and then when used up toss the jar and start a new one.

I found that in the summer, it dried quick enough for me just using water (I had a jug of distilled water - maybe overkill?).  Caleb also told me it is perfectly OK to rivet together parts before the Cortec dried ... just be sure you're not going to reposition or be taking them apart again because if riveted wet, it'll glue the parts together! I actually kind of liked putting things together that way since if you got the Cortec a little thick, you'd get a squeeze-out that would really seal up the mating surfaces nicely.

Being a thrifty type person I automatically interpret the instruction to 1 part CORTEC to 9 parts distilled water. That dilution was still milky color brushed easy and dried clear and smooth. and quickly.I stored the premix in a plastic pint container with a screw on lid when I found that the lid on a glass jar would be glued on permanently. The plastic bottle can be squeezed and distorted enough to release the seal on the lid.

Thanks all...will have a chance to brush it on tomorrow.  Also have some Zinc Oxide primer I will use on the "non-flayed" surfaces within the stab



New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2021   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service