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Another Paint/Filler question
#1
I've got an original rear spoiler on my Mach, "very heavy" seems to be some type of solid resin/fiberglass material. Last year I sanded it down and used some Bondo glazing and spot putty to fill in imperfections (pits/scratches) prior to painting it. Yesterday was the hottest day of the year for us and the first day the car was out in the sun all day...the spoiler rejected the Bondo and it bubbled up under the paint where I used the Bondo. This morning I took the spoiler off and have sanded it down again removing all of the Bondo. Apparently the Bondo expands at a different rate than the material in the spoiler when exposed to heat.

Any recommendations on what I should use to fill in the imperfections prior to repainting it again?

Jim

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
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#2
I have used fiber glass resin as fill before on fiberglass. It works well but can be very tricky to get smooth. I have also used fiberglass hole filler for deep pits. Which is a mixture of ground up fiberglass and resin. This sands down nicely but I would now use for extremely large areas.

It is inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians.

Henrik Ibsen
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#3
Jim and Jutta;83620 Wrote:I've got an original rear spoiler on my Mach, "very heavy" seems to be some type of solid resin/fiberglass material. Last year I sanded it down and used some Bondo glazing and spot putty to fill in imperfections (pits/scratches) prior to painting it. Yesterday was the hottest day of the year for us and the first day the car was out in the sun all day...the spoiler rejected the Bondo and it bubbled up under the paint where I used the Bondo. This morning I took the spoiler off and have sanded it down again removing all of the Bondo. Apparently the Bondo expands at a different rate than the material in the spoiler when exposed to heat.

Any recommendations on what I should use to fill in the imperfections prior to repainting it again?

Jim
Poor adhesion & wrong cheap materials for the job..Plain & simple..
You need evercoat polyester glazing putty..Then a quality 2k primer

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
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#4
Is Bondo good for anything?

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#5
The spoiler is a fiberglass two part clam shell, hollow inside. It shouldn't be very heavy. I repaired mine with fiberglass convoluted mat and activated resin. Chuck
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#6
Mine is cracking/separating along the front edge. Is there a way to repair this?

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
  Reply
#7
Don65Stang;83650 Wrote:Mine is cracking/separating along the front edge. Is there a way to repair this?

Get all the paint of the area to be repaired and use Evercoat fiberglass kit that comes with the convoluted/chopped mat, not the woven mat (you won't need hardly any mat as you are repairing the seam where the two halves are bonded together, I think). You'll also need decent primer and semi-floss black. Play with the fluid/pattern on the gun and line pressure until you can simulate the pebble grain.
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#8
HighOctane;83625 Wrote:I have used fiber glass resin as fill before on fiberglass. It works well but can be very tricky to get smooth. I have also used fiberglass hole filler for deep pits. Which is a mixture of ground up fiberglass and resin. This sands down nicely but I would now use for extremely large areas.

Thanks I'll try the resin, the local auto shop has a polyster fiberglass resin in a small a 4 OZ container.

Poor adhesion & wrong cheap materials for the job..Plain & simple..
You need evercoat polyester glazing putty..Then a quality 2k primer
[/quote]

Thanks, local auto shop didn't have the evercoat polyester glazing putty but they did have polyester 3M resin and the 2K primer.

c9zx;83648 Wrote:The spoiler is a fiberglass two part clam shell, hollow inside. It shouldn't be very heavy. I repaired mine with fiberglass convoluted mat and activated resin. Chuck

Thanks Chuck, I just assumed it was solid since it weighs so much but tapping on it I see you're correct, it's hollow. Mine weighs 11 pounds which feels heavy to me.

Jim

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
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#9
Thanks Chuck, I just assumed it was solid since it weighs so much but tapping on it I see you're correct, it's hollow. Mine weighs 11 pounds which feels heavy to me.

Jim
[/quote]

Sounds like time to hit the ole gym Tongue
  Reply
#10
24- 12oz beers should do it!

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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