shrinkage/sinkage lines after respray
Discussion
Recently had a full respray and after the recent hot weather a few sinkage/shrinkage lines have appeared on an area of the car where filler was used. The lines follow the edges of the filler repair, you can't feel the ridge and it takes some spotting, but as it's on the roof at eyeline it's one of those things you just can't unsee once you spot it.
Car is going back to the bodyshop who are being excellent about sorting it asap.
For my own curiousity - would affected panels (the roof in this instance), need repainting, or can sinkage lines be rubbed back and polished without needing more paint?
It's an otherwise excellent paint job by a very well regarded paint shop, so i'm not overly concerned, but will feel more comfortable knowing it is getting a cut and polish rather than further paint. (this is the second respray as the first paint shop royally messed it up).
Car is going back to the bodyshop who are being excellent about sorting it asap.
For my own curiousity - would affected panels (the roof in this instance), need repainting, or can sinkage lines be rubbed back and polished without needing more paint?
It's an otherwise excellent paint job by a very well regarded paint shop, so i'm not overly concerned, but will feel more comfortable knowing it is getting a cut and polish rather than further paint. (this is the second respray as the first paint shop royally messed it up).
Edited by designforlife on Wednesday 25th April 14:21
Squiggs said:
The short answer is not the one you want to hear.
It sounds like the filler has sunk/shrunk and the only fix is sanding it back and re-spraying.
That just isn't true.It sounds like the filler has sunk/shrunk and the only fix is sanding it back and re-spraying.
Fresh paint sometimes sinks back around primer repairs after a few weeks or months...even when there's no filler involved....and is easily fixed with a flat and polish.
V8covin said:
Squiggs said:
The short answer is not the one you want to hear.
It sounds like the filler has sunk/shrunk and the only fix is sanding it back and re-spraying.
That just isn't true.It sounds like the filler has sunk/shrunk and the only fix is sanding it back and re-spraying.
Fresh paint sometimes sinks back around primer repairs after a few weeks or months...even when there's no filler involved....and is easily fixed with a flat and polish.
Too much thinners?
Edited by Squiggs on Wednesday 25th April 23:58
it's going back today all being well so i will find out how they intend to rectify it.
Is it common to see shrinkage 4 or 5 weeks after paint? Clearly that unseasonably hot few days was a big factor in triggering it.
All a little close to japfest for my liking, but they assure me they'll have it rectified in time.
One other question - the fresh lacquer is being pretty well attacked by the pollen that's accompanied this hotter weather, a few water spots have etched the lacquer already (not at paint level).
While these will polish out, is it usual for fresh lacquer to be so delicate? I know pollen can be pretty acidic and horrible stuff when mixed with rain.
Is it common to see shrinkage 4 or 5 weeks after paint? Clearly that unseasonably hot few days was a big factor in triggering it.
All a little close to japfest for my liking, but they assure me they'll have it rectified in time.
One other question - the fresh lacquer is being pretty well attacked by the pollen that's accompanied this hotter weather, a few water spots have etched the lacquer already (not at paint level).
While these will polish out, is it usual for fresh lacquer to be so delicate? I know pollen can be pretty acidic and horrible stuff when mixed with rain.
You have to understand every layer of material....bodyfiller,etch primer,primer filler,sealer,basecoat,clear ....has its own curing time.
Conventional oven baking cures from the outside in so it may appear fully hardened but isn't really and when you get a new heat source....like you did withe a period of hot weather....that can accelerate the process ,solvents are released and shrinkage occurs.
It's more common on bonnets because of heat from the engine.....and it's more likely to be the primer shrinking than bodyfiller.
Ideally paint should be left a few months before polishing to fully cure....when I say polishing I actually mean flatting the clear with 1200 grit or finer and then compounding with a machine polisher....but no one wants to wait do they,so fresh paint gets polished within hours or the next day usually
Conventional oven baking cures from the outside in so it may appear fully hardened but isn't really and when you get a new heat source....like you did withe a period of hot weather....that can accelerate the process ,solvents are released and shrinkage occurs.
It's more common on bonnets because of heat from the engine.....and it's more likely to be the primer shrinking than bodyfiller.
Ideally paint should be left a few months before polishing to fully cure....when I say polishing I actually mean flatting the clear with 1200 grit or finer and then compounding with a machine polisher....but no one wants to wait do they,so fresh paint gets polished within hours or the next day usually
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