• 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Paint question on rear spoiler
#1
I have an original rear spoiler that no matter what I do I keep having bubbles that show up, it's not the paint rising it's the fiberglass bubbling. I've tried everything including sanding all the paint off then resurfacing areas with fiberglass repair to insure it's super smooth. After a few months the fiberglass bubbles appear again, it seems to happen when the car has been parked in the sun for a while on a hot day. I've redone it I believe 3 times and a had a paint shop do it once, but the bubbles keep coming back in the same spot. Any suggestions would be appreciated.


.jpg   Bubbles.JPG (Size: 22.01 KB / Downloads: 158)

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
  Reply
#2
Well...since you said any suggestion.

Go buy an aftermarket fiberglass rear spoiler.

[/url][Image: mbpsrsig3_zps456db2cb.png]

[url=http://s165.photobucket.com/user/MPBsr25/media/mbpsrsig3_zps456db2cb.png.html]
  Reply
#3
Jim and Jutta;286041 Wrote:I have an original rear spoiler that no matter what I do I keep having bubbles that show up, it's not the paint rising it's the fiberglass bubbling. I've tried everything including sanding all the paint off then resurfacing areas with fiberglass repair to insure it's super smooth. After a few months the fiberglass bubbles appear again, it seems to happen when the car has been parked in the sun for a while on a hot day. I've redone it I believe 3 times and a had a paint shop do it once, but the bubbles keep coming back in the same spot. Any suggestions would be appreciated.

Have you tried literally grinding out the entire bad spots? It could be that there is moisture inside the skin that has not been removed. It may take digging in there to remove all the affected material, then carefully rebuilding the surface. I had a similar issue on a prototype I was building. Getting tough with it fixed it in the end. I'm NOT saying this IS the problem, but if moisture is present within the skin, it could be the cause for it returning time and time again. Just a thought, others may have different ideas.
  Reply
#4
Hi Jim,

What Geoff and Mark have said so far is good advice. As i see it, basically you have two major options here to choose from. The first option is to keep on persevering with trying to remedy and repair your existing spoiler.The second is to cut your losses, and buy a new fiberglass spoiler and refinish it to your liking. There are arguments for both options, and you will have to decide which one is best for you. It really comes down to a money thing here.

You have been faced with a blistering or bubble problem on your fiberglass spoiler. That is a fairly common problem with fiberglass itself. Fiberglass can be a bitch of a material, and play up badly sometimes.This can be from moisture probs or gel coat pobs. I won't get technical here. You say that you have made 3 attempts yourself to try and fix the problem, and your paint shop has had a go once but failed as well to fix the problem as it keeps on coming back. When you look at that from a labor and materials perspective, eg, a cost perspective, i'm sure that you have thrown a fair bit of money trying to rectify this problem.

But the overall news is not good for you, because the reality is, that you can try and have another attempt at fixing this problem, throw even more money at it, but unfortunately, there will be no guarantee that the problem will not come back again. The initial cost to buy the spoiler, plus all this extra money you are putting into it, gets out of hand. On that basis, sometimes it pays just to cut your losses and start again with a new, good quality fiberglass spoiler, and refinish it to your own taste.

I can give you technical advice on trying to fix your blistering problem, but i can't guarantee that will completely solve your problem, and the blisters will never come back. The basic tech advice is as follows. First up, you don't mix two pack paints with acrylic lacquer paints, or to be more specific, you can't put two pack paints over lacquer paints. What paints have you been using so far to try and fix the spoiler? Also, have you or your spray shop attempted to back gouge out where the bubbles are, and back fill in the holes or depressions left behind?

My attack on the bubbles would be to first, sand down to the fiberglass level around the bubble areas. Next carve or gouge out the fiberglass bubbles well into the glass layer. Next, and with the glass being super dry, spray two or three good coats of epoxy primer on those spots and surrounding raw fiberglass areas. This seals the fiberglass surface off, and gives you a good sound base to work from here. Next, scuff dry the epoxy primer, and back fill in the holes with a two pack wiping putty. I would choose a product that has aluminium mixed in with the putty. This type of product is used for repairing metal rust holes, and cures out very hard. Sand the filler down level, and apply another two coats of epoxy primer over the repair spot areas. Lightly scuff down that primer dry, and then prepare the rest of the spoiler for priming the whole thing with three or four coats of standard 2 pack urethane primer/ filler. Sand that down when cured, and then move into your top black color coats. You can choose to use a 2 Pack mat or satin black paint here, or you can use a mat or satin black acrylic lacquer as an option. I like using a lacquer, as i don't end up getting any nibs in the paint finish at the end. With lacquer, i can remove all nibs on the fly, and get a nib free finish - with 2 pack, you can't do that.

Remember, if you have lacquer black paint on your spoiler now to start off with, you can't apply any 2pack or epoxy paints over the lacquer paint. If you need any more detailed tech info, PM me.

Hope all that helps make up your mind on which way you want to go.

Thanks,

Greg.Smile

whistling LORD, MR FORD - JERRY REED
  Reply
#5
I don't know why your having this problem but I think I would just cut my losses and buy another wing and if it were me I would shop around and find an original Ford piece at a swap meet. I've seen plenty of them at Ford Carlisle and at other swap meets. The original Ford wings seem to have better quality and in my opinion look better on the car. I know many people are going to disagree with my last comment so I will end this by saying it's just my opinion and we're all entitled to that.Smile

Going fast is fun but life is short so slow down and enjoy the ride Big Grin Frank
  Reply
#6
Here you go. original spoilers from a member.

http://www.7173mustangs.com/thread-original-spoilers

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply
#7
mpbsr;286042 Wrote:Well...since you said any suggestion.

Go buy an aftermarket fiberglass rear spoiler.

At this point thinking about it.

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
  Reply
#8
[/quote]

Have you tried literally grinding out the entire bad spots? It could be that there is moisture inside the skin that has not been removed. It may take digging in there to remove all the affected material, then carefully rebuilding the surface. I had a similar issue on a prototype I was building. Getting tough with it fixed it in the end. I'm NOT saying this IS the problem, but if moisture is present within the skin, it could be the cause for it returning time and time again. Just a thought, others may have different ideas.
[/quote]

Yep, grinded them down smooth, really didn't dig out any out though, that may be the solution, thanks

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
  Reply
#9
Austin Vert;286073 Wrote:Hi Jim,

What Geoff and Mark have said so far is good advice. As i see it, basically you have two major options here to choose from. The first option is to keep on persevering with trying to remedy and repair your existing spoiler.The second is to cut your losses, and buy a new fiberglass spoiler and refinish it to your liking. There are arguments for both options, and you will have to decide which one is best for you. It really comes down to a money thing here.

You have been faced with a blistering or bubble problem on your fiberglass spoiler. That is a fairly common problem with fiberglass itself. Fiberglass can be a bitch of a material, and play up badly sometimes.This can be from moisture probs or gel coat pobs. I won't get technical here. You say that you have made 3 attempts yourself to try and fix the problem, and your paint shop has had a go once but failed as well to fix the problem as it keeps on coming back. When you look at that from a labor and materials perspective, eg, a cost perspective, i'm sure that you have thrown a fair bit of money trying to rectify this problem.

But the overall news is not good for you, because the reality is, that you can try and have another attempt at fixing this problem, throw even more money at it, but unfortunately, there will be no guarantee that the problem will not come back again. The initial cost to buy the spoiler, plus all this extra money you are putting into it, gets out of hand. On that basis, sometimes it pays just to cut your losses and start again with a new, good quality fiberglass spoiler, and refinish it to your own taste.

I can give you technical advice on trying to fix your blistering problem, but i can't guarantee that will completely solve your problem, and the blisters will never come back. The basic tech advice is as follows. First up, you don't mix two pack paints with acrylic lacquer paints, or to be more specific, you can't put two pack paints over lacquer paints. What paints have you been using so far to try and fix the spoiler? Also, have you or your spray shop attempted to back gouge out where the bubbles are, and back fill in the holes or depressions left behind?

My attack on the bubbles would be to first, sand down to the fiberglass level around the bubble areas. Next carve or gouge out the fiberglass bubbles well into the glass layer. Next, and with the glass being super dry, spray two or three good coats of epoxy primer on those spots and surrounding raw fiberglass areas. This seals the fiberglass surface off, and gives you a good sound base to work from here. Next, scuff dry the epoxy primer, and back fill in the holes with a two pack wiping putty. I would choose a product that has aluminium mixed in with the putty. This type of product is used for repairing metal rust holes, and cures out very hard. Sand the filler down level, and apply another two coats of epoxy primer over the repair spot areas. Lightly scuff down that primer dry, and then prepare the rest of the spoiler for priming the whole thing with three or four coats of standard 2 pack urethane primer/ filler. Sand that down when cured, and then move into your top black color coats. You can choose to use a 2 Pack mat or satin black paint here, or you can use a mat or satin black acrylic lacquer as an option. I like using a lacquer, as i don't end up getting any nibs in the paint finish at the end. With lacquer, i can remove all nibs on the fly, and get a nib free finish - with 2 pack, you can't do that.

Remember, if you have lacquer black paint on your spoiler now to start off with, you can't apply any 2pack or epoxy paints over the lacquer paint. If you need any more detailed tech info, PM me.

Hope all that helps make up your mind on which way you want to go.

Thanks,

Greg.Smile


Really great advice Greg, thanks for taking the time to go into such details, it's what makes this site so great. As far money invested in doing the repairs myself, it's primarily just my time except when I had a paint shop do it. It lasted longer than my repaint but they still came back. I may use some tough love on it and really dig those areas out and give it one last try following your instructions. I've PM'ed a local member who has a couple for sale to check those out. Thanks!

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
  Reply
#10
73pony;286092 Wrote:Here you go. original spoilers from a member.

http://www.7173mustangs.com/thread-original-spoilers

Thanks Jason, PM sent

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
  Paint runs and dust nibs OzCoupe72 5 180 03-13-2019, 10:11 PM
Last Post: OzCoupe72
  1973 Non-Staggered Shocks Rear Sway Bar Installation clevelandcoupe 1 116 03-10-2019, 09:28 PM
Last Post: Hemikiller
  which black paint for inner wheel arches baz70 8 334 02-05-2019, 04:21 PM
Last Post: baz70
  Welding question on front aprons slowpoke17 4 357 01-08-2019, 10:00 AM
Last Post: Hemikiller
  Rear Window sealI keiths71 12 522 01-07-2019, 01:56 PM
Last Post: OMS
  Torsion Bars Trunk Convertible - dealer added spoiler too heavy timachone 37 1,420 12-27-2018, 11:13 AM
Last Post: timachone
  Mach1 rear bumper tawod 10 599 12-17-2018, 08:31 AM
Last Post: OMS
  1970 vs 1971 rear frame garrett7 2 334 12-13-2018, 05:53 PM
Last Post: Mister 4x4



Users browsing this thread: 1 Guest(s)