Senior Member
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Clear coat cracking paint..on one part only?
I'm repainting my bike and I'm running into an odd problem.... I've prepped and painted all the parts the same way (fenders, tank, side panels) by doing the following:
1. Sanded down the old finish down
2. Primed the surface, sanded it down
3. Painted 2-3 coats, wet sanding between coats with a finer and finer grit
I waited a good day in between painting the primer and paint, and then a day since the last sanding of the painted surface with 2000 grit sandpaper. I sprayed clear on the tank and the side panels today and while it took just fine on the tank and one of the side panels, the other side panel immediately started cracking horribly..
Here's what it looks like: http://imgur.com/a/0TMTG
You can see the good side panel in the first photo, the bad one in the second, and both in the last. I don't understand what I did wrong, both panels were prepped and painted in exactly the same way, with identical dying in between coats and the same exact cans of paint used on both.
Any ideas? At this point I'm thinking I need to sand it back down completely and start over...
1. Sanded down the old finish down
2. Primed the surface, sanded it down
3. Painted 2-3 coats, wet sanding between coats with a finer and finer grit
I waited a good day in between painting the primer and paint, and then a day since the last sanding of the painted surface with 2000 grit sandpaper. I sprayed clear on the tank and the side panels today and while it took just fine on the tank and one of the side panels, the other side panel immediately started cracking horribly..

Here's what it looks like: http://imgur.com/a/0TMTG
You can see the good side panel in the first photo, the bad one in the second, and both in the last. I don't understand what I did wrong, both panels were prepped and painted in exactly the same way, with identical dying in between coats and the same exact cans of paint used on both.
Any ideas? At this point I'm thinking I need to sand it back down completely and start over...

'92 Kawasaki Vulcan 750
Mods:
Rattle-can high gloss black paint job
Frame, engine, Headers/exhaust painted satin black
Ears shaved, K&N pod filters
TPE Stator, MOSFET R/R, Magna Power AGM battery
Pickup Coil mod
New mirrors, grips, cables
VN900 seat
Straight pipes with 8" baffles
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My guess is that the nasty looking side cover was replaced and a quick paint job was thrown on it to make it match. What it looks like is the quickie paint started reversing and puckered. Your only hope is to sand the finish down until you get rid of the paint that's puckering, you may end up sanding down to bare plastic. Just curious what type paint/primer you are using, rattle can or catalyzed urethane? With a bit more work it will come out.
87 vn750at least that is what the frame #'s say
"Squirrel Bike" aka Jersey
Rat bike with a good PR agent
shaved and coastered
2 into 1 exhaust
rear 170 and front 110
Relocated R/R
custom dash with voltmeter
Spitfire windscreen
Plutonium plugs
Recovered seat without "butt hammers"
More to come
Praise to the Parts Goddess Crobins for needed things
When someone tells me "Great minds think alike" all I can think is "You Pervert"
Senior Member
Rattle can unfortunately, can't afford the setup for the good stuff. It was already sanded down do the bare plastic. I'm guessing I did something wrong at some point.
'92 Kawasaki Vulcan 750
Mods:
Rattle-can high gloss black paint job
Frame, engine, Headers/exhaust painted satin black
Ears shaved, K&N pod filters
TPE Stator, MOSFET R/R, Magna Power AGM battery
Pickup Coil mod
New mirrors, grips, cables
VN900 seat
Straight pipes with 8" baffles
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Did you mix enamal with latex?
ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY
lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
Super Moderator
my side cover did exactly the same thing.. and I sanded down to bare plastic, twice
other side panel perfectly fine.
other side panel perfectly fine.
2005 VN750
Sold 11-27-17
Senior Member
No, enamel with enamel. I specifically bought all of the same type/brand to avoid this issue.
'92 Kawasaki Vulcan 750
Mods:
Rattle-can high gloss black paint job
Frame, engine, Headers/exhaust painted satin black
Ears shaved, K&N pod filters
TPE Stator, MOSFET R/R, Magna Power AGM battery
Pickup Coil mod
New mirrors, grips, cables
VN900 seat
Straight pipes with 8" baffles
Try a good prep spray like prep all.maybe grease.what's the cure time on the paint?maybe the clear was sprayed too soon?
ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY
lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
Senior Member
I'm gonna sand it down tonight and start over. I didn't use a prep spray since I had sanded down the original paint - didn't think it'd be necessary. I'll give it a go since I need to pick up another can of paint now.
'92 Kawasaki Vulcan 750
Mods:
Rattle-can high gloss black paint job
Frame, engine, Headers/exhaust painted satin black
Ears shaved, K&N pod filters
TPE Stator, MOSFET R/R, Magna Power AGM battery
Pickup Coil mod
New mirrors, grips, cables
VN900 seat
Straight pipes with 8" baffles
Grease and wax build up in the paint and stay on the surface as you sand
ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY
lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
Super Moderator
on mine, I used primer, color and clear, all same brand. time frame between color coats within what the manufacturer says (long enough to flash). clear coats was a minimum of 24 hrs. lots of sanding before paint (as I said, took the plastic parts down to bare plastic).
Note: when mine first did this, I redid all steps (including taking it back down to bare plastic), and redid the primer, sand, primer, sand primer, paint, paint, sand, paint, paint, let dry good, then clear, clear, sand, clear, sand, clear. same exact result on that cover.
well, the exact order and number of paint/sand and such may not have been what I posted, but it was similar to that.
Note: when mine first did this, I redid all steps (including taking it back down to bare plastic), and redid the primer, sand, primer, sand primer, paint, paint, sand, paint, paint, let dry good, then clear, clear, sand, clear, sand, clear. same exact result on that cover.
well, the exact order and number of paint/sand and such may not have been what I posted, but it was similar to that.
2005 VN750
Sold 11-27-17
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