Jump to content

Newbie question about glassing the permanent firewall.


Recommended Posts

I’m getting ready to glass the permanent firewall and I’m not sure about surface prep of the plywood. I don’t know if I use micro as I would a foam core or just start with resin on the surface? I was planning on just lightly sanding the surface and do the lay up right on the wood. Anyone have any advice?



Cozy MKIV #1184

Link to comment
Share on other sites

No micro slurry needed when applying fiberglass over wood.


1. Vacuum the wood thoroughly.

2. Brush on a generous coat of pure epoxy. (Don't use any micro slurry.)

3. Lay the fiberglass on the wood and allow it to soak up the epoxy.

4. Brush on more epoxy as needed to wet out the fiberglass.

5. Stipple and squeegee as you would for foam.


Hope this helps!

Wayne Hicks

Cozy IV Plans #678


Link to comment
Share on other sites

I'm not sure if the Cozy is the same as the LongEZ in this respect, however,;


If your plywood has a cutout (presumablly for making it lighter) over the center spar area, I would recommend putting the cutout piece back in.


What I've found over the years, it seems like whenever I mount something on the firewall, it always seems like the bolt needs to go through where the cutout is missing. With the 1/4 inch gap (where the cutout is), it makes for a very sloppy bolt mounting.



F16 performance on a Piper Cub budget

LongEZ, 160hp, MT CS Prop, Downdraft cooling, Full retract

visit: www.iflyez.com

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information