Create a perfect fiberglass finish

Create a perfect fiberglass finish

Here’s another how-to from veteran builder Rick Michelena. Enjoy!

Do you have the desire to build a warbird or other scale project but desire something more than an iron-on finish? Are you unsure of the steps required in the process of finishing a radio-controlled airplane in fiberglass and paint? This article will give you the knowledge required to finish any project. In fact, by following these steps, your models will look better than 95% of the models appearing at your local club.

Before we begin, I would like to mention that I do not compete in Top Gun events nor spend the necessary time required to build these master- pieces. I build my models to fly and to last. As those who know me will attest, my models have each accumulated thousands of flights over 25+ years in service. My motto is simple: No hangar queens!

However, if you desire to learn how to fiberglass and paint, these tips will help you go the “extra mile.” With that said, let’s discuss the necessary steps involved in producing an excellent finish on your next project.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

This is the wing of my giant scale F8F Bearcat. It is a foam core covered in 3/32″ balsa skins and has been sanded with #100 sandpaper.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

Lightweight spackling is the secret for creating a perfectly level finish. It is available at both Lowes and Home Depot. It is lightweight and will fill every imperfection in your balsa skins.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

After I blow all the sanding dust off the wing, I use a spray bottle and water to slightly dampen the balsa skin. With a plastic “Bondo” spreader, I spread the spackling all over the wing area. If it becomes dry, mist some water on it to smooth it out. I allow this to dry overnight.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

I do the same procedure with all the flight controls.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

This is the horizontal stabilizer. Please notice the darker area where I used fiberglass tape to attach it to the fuselage.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

I then skimmed the lightweight spackling over all the surface. This is an important step in leveling any surface and is an essential step in paint preparation.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

A Black & Decker Mouse sander will save both time and energy. I begin with #100 paper and use a block-sanding motion (sanding back and forth in an “X” pattern) to level the surface where the fiberglass cloth will lie.

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

Remove the majority of the lightweight spackling, and this surface is now perfectly level in preparation for the next procedure, which is fiberglassing. Don’t let this next step scare you. The process is easier than you think.

 

Model Airplane News - RC Airplane News | Create a perfect fiberglass finish

Here are the simple items needed to produce a fiber-glass finish that will last for many years. You will need the following: 3/4 ounce fiber-glass cloth, 90% isopropyl alcohol, Z-Poxy finishing resin, mixing cups, stir stick, scissors, and sponges cut in small squares.  We’ll continue with the rest of this project next week — stay tuned!

 

Updated: November 8, 2015 — November 8, 2015
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