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Cracked acrylis top

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
I have a crack in the Acrylic top of my 85. I wasn't too worried about it until I jacked the car up yesterday and saw how much flex these cars have. The crack opened up like the Red Sea when I jacked up the front right.

Upon doing a search I've seen two suggested fixes although the threads were very old (2001). One was some kind adhesive from 3M the other was a LORD adhesive. Does anybody know if they've come out with anything better in the last 5 years? What are current members using? Can you use heat to fuse the crack together, maybe from the inside where it wouldnt show?

I put a couple bids for tops on ebay but they don't end for a while and it's supposed to rain tomorrow.
 

gmhowe

Well-known member
Joined
Nov 14, 2002
Messages
437
Location
glendale, az
Corvette
1985 4+3 black cpe & 96 LT1 CE
I have 2 cracks on my 85 both on each of the back corners, I actually used superglue and let it seep into the cracks, seems to be holding but if anybody has anyother ideas I am open to them, since Im not sure how long the super glue will hold since summer is coming here in Phoenix.
 

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
I was looking at adhesives (actually looking for some clear epoxy) when a sales associate approached, we talked, and it came out that he too had a Corvette. He suggested silicone because of the flex. Then another associate approached, heard the problem and said Advanced Auto Parts carries a special adhesive for Corvette tops and other Auto Parts store might also. He knew this because he used to work there. Since we don't have an Advanced around here, I went to AutoZone. They didn't have a clue. I'll try Advanced this weekend when I go to Virginia.

Super Glue huh? Never had much luck with it although Gorilla Glue is very strong.
 
F

fatboyreyn

Guest
I had a crack in my top before I replaced it, and had silicon caulk on the crack and it worked like a champ. Held off water and flexed with ease. It was ugly though because I used clear silicon. If you try this, make sure it is 100% silicon caulk. The cheap stuff won't hold good.
 
F

fatboyreyn

Guest
Forgot to tell you, I just got a top off of (jgibson59) on ebay. It was 425 and 55 to ship and a 200 core deposit. The top is an excellent product mounted on original GM frame, and fits perfectly. I had purchased a cheaper one , but plastic was thinner, frame was lighter, and assembly was shabby, as was the fit.
 
1

1984C4

Guest
Don't forget to stop drill the crack first before you put silicone in it so the crack wont continue to grow. Thats what I did. I hate having the crack but I usually use the hard top anyway and replacements are not worth the money. They will crack also.
 

gmjunkie

Well-known member
Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
I have 1 Near Perfect (No Cracks,No crazing!!) Blue Tint, 84-86 1st design!! Perfect Rubbers!!

Actually Guy's I have decided not to Sell it!!! I will need it some day!! And at Todays Prices if I sell it it will cost me $844.00 to replace it without a Core and even then it won't be Original GM!!!

Sorry for any Inconvenince!!!
 
F

fatboyreyn

Guest
I think as long as you remove top before jacking car up, and don't do any curb jumping, the top shouldn't crack. You just have to be aware of the terrain yoour on!!! I hope so anyway, cause I just invested $500 in a new one, and if it cracks anytime soon, I might go POSTAL!!!
 

pitt

Member
Joined
Aug 1, 2006
Messages
13
Location
Sarasota Florida
Corvette
94 bright white coupe
crack fix

I have a crack in the Acrylic top of my 85. I wasn't too worried about it until I jacked the car up yesterday and saw how much flex these cars have. The crack opened up like the Red Sea when I jacked up the front right.

Upon doing a search I've seen two suggested fixes although the threads were very old (2001). One was some kind adhesive from 3M the other was a LORD adhesive. Does anybody know if they've come out with anything better in the last 5 years? What are current members using? Can you use heat to fuse the crack together, maybe from the inside where it wouldnt show?

I put a couple bids for tops on ebay but they don't end for a while and it's supposed to rain tomorrow.
I have a 94 with a crack (luckily ?) dead center down the middle front. I went to discount auto parts and got a roll of 6 inch white rally striping and put it down the center,car is white. then I went to wallmart and got some clear ductape and used that on the inside.It worked perfectly and I actually like the look!
 

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
Junk - I sent you a PM
 

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
Repair or replace

Don't forget to stop drill the crack first before you put silicone in it so the crack wont continue to grow. Thats what I did. I hate having the crack but I usually use the hard top anyway and replacements are not worth the money. They will crack also.

What do you mean "drill the crack"? I was thinking of using a dremel to grind a small furrow along the crack , then filling it with epoxy?? Will this weaken the top?

I hope Junk comes through as I was outbid on ebay and I don't want to pay $500.
 

Zblast

Well-known member
Joined
Sep 29, 2004
Messages
92
Location
CENTRAL PA
Corvette
2013 427 Anniversary Edition Vert
Junk, check your PM box. :beer
 
1

1984C4

Guest
What do you mean "drill the crack"? I was thinking of using a dremel to grind a small furrow along the crack , then filling it with epoxy?? Will this weaken the top?

A crack will continue to grow with vibration and movement. You need to drill a small hole at the end of the crack to basicly stop it from growing. The round hole is now a new non cracked edge. We do this as a temporary repair on aircraft sheet metal all the time. The acrylic top drill very easily at high speed. Use about an 1/8'' bit. I did not furrow a groove in mine. I simply put tape on either side of the crack about an 1/8" and gooped it up then removedthe tape for a nice crisp weather tight repair. You will see it but you can learn to live with it.
 

Rabbit

Well-known member
Joined
Dec 19, 2001
Messages
956
Location
sonoma ca usa
Corvette
2004 C5 coupe, MSGM & 2014 Cad SRX Crystal red
:beer
What do you mean "drill the crack"? I was thinking of using a dremel to grind a small furrow along the crack , then filling it with epoxy?? Will this weaken the top?

A crack will continue to grow with vibration and movement. You need to drill a small hole at the end of the crack to basicly stop it from growing. The round hole is now a new non cracked edge. We do this as a temporary repair on aircraft sheet metal all the time. The acrylic top drill very easily at high speed. Use about an 1/8'' bit. I did not furrow a groove in mine. I simply put tape on either side of the crack about an 1/8" and gooped it up then removedthe tape for a nice crisp weather tight repair. You will see it but you can learn to live with it.

Good advice :beer
 

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
I will try it! Thanks for the tips. One more question, can this be done on the inside where it won't show?
 

TIMS-98Vette

Member
Joined
Feb 20, 2006
Messages
13
Location
Indiana
Corvette
1998 Torch Red Coupe
Why not try a little fiberglass reson with hardner. you would be supprised how strong it is and sets up clear.
 

Hot Rod Roy

Well-known member
Joined
Jul 6, 2005
Messages
317
Location
Mission Viejo CA
Corvette
Yellow '84 Coupe
I've used flowable silicone windshield sealant (Permatex 65AR) for similar repairs. It has a lower viscosity than regular silicone caulk, so it will flow into the crack. It is also a very good adhesive, so it doesn't peel away from the acrylic surface. Because of the low viscosity, put a strip of tape on the bottom surface of the crack, so the sealant doesn't drip out the bottom. You might want to do the job in several settings, so you can control where the stuff flows! Mask off the surfaces where you don't want to get the sealant, because it's almost impossible to get it off without damaging the surface!

:w S.T.W.
 

Glide

Well-known member
Joined
Jan 23, 2007
Messages
118
Location
Charles Town, WV
Corvette
1971 Shark, 1985 C4, 2011 C6, 99 FRC. 66 Coupe
Top repair

I've used flowable silicone windshield sealant (Permatex 65AR) for similar repairs. It has a lower viscosity than regular silicone caulk, so it will flow into the crack. It is also a very good adhesive, so it doesn't peel away from the acrylic surface. Because of the low viscosity, put a strip of tape on the bottom surface of the crack, so the sealant doesn't drip out the bottom. You might want to do the job in several settings, so you can control where the stuff flows! Mask off the surfaces where you don't want to get the sealant, because it's almost impossible to get it off without damaging the surface!

:w S.T.W.

This sounds like the least intrusive repair process I've heard of yet. I could not find this product at any auto parts store. Where can I find some Permatex 65AR?
Thanks!
 

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