Patching fiberglass on a T body isn’t as hard as you might think. You may have purchased a T-Bucket body where the previous owner cut something out for clearance or maybe it has a hole from some other damage and patching fiberglass becomes a necessary skill. You’ll learn how to do it the easy way that will make it last in this installment on patching fiberglass in our Bob Hamilton ’27 T roadster building series. Bob covers all the details of street rod building in a similar logical fashion in the very informative StreetRod 101 DVD Library available at our sister site, StreetRodPlans.com.
Follow along to get the straight dope on patching fiberglass in Bob Hamilton’s latest installment in the building of his 1927 T roadster.
Patching Fiberglass T-Bucket and Roadster Bodies
“With the body flipped over, I went ahead and finished the rear roll pan by adding some fiberglass bondo and then finishing off with some ultra lite bondo. This picture also shows the extent of the wheel well cutout from when the body was on a drag car that I am going to fix by patching the fiberglass next.”
“I took my flat table,covered it with wax paper and then laid up 4 layers of 1 oz. fiberglass matte, let set up and then repeated the process and wound up with two flat pieces big enough to do the fiberglass patching by covering each of the openings. I then sanded the area on the back side of the body with 40 grit sandpaper on a small hand electric sander and got all of the ridges and bumps out so that the flat pieces I just made would lay flat.”
“Next I cut the flat pieces about two inches larger than the area to receive the fill patch. Using fiberglass bondo, I coated the inside around the opening and placed the flat pieces against the body and secured them in place with six sheet rock screws – into pre drilled holes. Then I used a bondo spreader and smoothed out the fiberglass bondo on both sides and let set up. This does two important things:
- one, it gives a great deal of strength to the panel by overlapping
- two, it allows the blending of the back and the front to occur.
I could have cut the flat panel to fit the opening and beveled both the body and the flat filler piece and then used matte on the back side and fiberglass bondo on the front and eliminated the step in the front. I have found that in this type of patching fiberglass situation, that I would rather have the strength that overlapping gives than go the other route. Not that it wouldn’t work, because it definitely would – I just wanted extra strength from the overlap. I then blended the front with some fiberglass bondo to fill some of the lower spots and then finished off with ultra lite bondo.”
“Here you can see what the back side of the filler piece looks like after some extra fiberglass bondo has been spread out and tapered. This gives some extra strength and makes it look a little better. I will build a flat panel from Luan plywood like available from Home Depot and cover it when I upholster the trunk area. This shot also shows the back of the cockpit bulkhead and how I filled the seam with fiberglass bondo to secure it in place and make it more rigid.”
“This body has a 4 inch body roll pan installed at the factory and it must have been done on a Monday or Friday because it definitely needed some extra work. I used my electric hand sander and sanded the edges as smooth as possible where the top of the roll pan and the bottom of the body were laminated together, roughed up the gel coat on both sides and then coated the entire length with fiberglass bondo and smoothed it out. After it set up, I again sanded the area and blended it as much as possible, filled in the places I missed or were low and then when they were cured, I used ultra lite bondo and finished blending the two together. It actually came out quite nice.”
“This picture shows the roll pan and the wheel well after the ultra lite bondo has been applied and sanded. From this point, there is just a little detail work to be done, and then these areas will be ready for the first coat of urethane primer.”
The straightforward, methodical approach Bob brings to patching fiberglass in this 1927 T roadster building series is meant to give you a taste of the kind of terrific hot rod building information he shares in both the Fiberglass Body Modifications and the Fiberglass Bodywork and Paint DVD sets in the comprehensive StreetRod 101 DVD Library we’re proud to make available through our sister website, StreetRodPlans.com.
Just click on the image above to see for yourself how much helpful and informative hot rod building information, tips and detail are included in these terrific DVD sets.
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