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 Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Need help
Ive put on carbonfibre decal the front wing , but I keep getting like air bubbles in the finish. Any ideas the front wheel assembles went fine..
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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The bubble like craters are forming from the clear coat not the decal, I normally leave the parts to dry after the carbon is finished, then spray.
Had a PM question so posted it here.
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Wow 120 views and no reply  Any one ????
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Rank: Pro  Groups: Registered
Joined: 05/04/2011 Posts: 266 Points: 784 Location: Essexshire
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Loonyllamas wrote:Wow 120 views and no reply Any one ???? 121 and ain't got a clue mate.... Warty will be along shortly
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Loonyllamas wrote:The bubble like craters are forming from the clear coat not the decal, I normally leave the parts to dry after the carbon is finished, then spray.
Had a PM question so posted it here.  Hi mate, The only thing I can think of is that maybe the clearcoat is adversely reacting with the chemical composition of the decal or even the ABS plastic beneath which would release tiny gas bubbles as it reacts and then the top layer of the bubble would 'pop' so to speak, BUT, if the clear coat is a fairly quick drying type the surface where the bubble was wouldn't have time to flatten out evenly before it set too hard to do so, thus leaving a 'crater' ?? Is the clear coat an Acrylic based product or Cellulose based and how quickly does it dry and also, is the 'cratering' only present over the decalled part or the whole wing including the painted parts ?? If it is Cellulose based then it is highly likely that it will be reacting with the ABS as Cellulose is quite an aggressive solvent and can melt plastic quite easily. Hope that helps ?? Regards ... Kev.
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 Rank: Elite        Groups: registriert, Registered Joined: 20/03/2011 Posts: 2,356 Points: 7,122 Location: UK
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I'm here lol Ok by the sounds of it when you say your doing the front wing its because your putting the decal onto the "Rough carbon effect" on the lower side of the wing.. you will get air trapped under this unless your using a decal softner.. The best way to do it is sand the effect off.. Hope i'm on the right track? Spence
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Using Micro Sol decal softner & halfords clear coat, Then allowing it to dry over night. Ive already finished the front wheel assemble and cleared it , looks great. So took the plunge to do the front wing. Used same process but all parts have had this bubble type effect or cratering. I've just sanded the clear and will try again 
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Loonyllamas wrote:Using Micro Sol decal softner & halfords clear coat, Then allowing it to dry over night. Ive already finished the front wheel assemble and cleared it , looks great. So took the plunge to do the front wing. Used same process but all parts have had this bubble type effect or cratering. I've just sanded the clear and will try again Hi mate, I've been doing some digging on the subject of lacquers and have found this: http://www.carpaintdepot.../basf/Paint_Defects.pdf
Since it is all about the use of lacquers and paints for spraying cars as opposed to the lacquers used on wood, which are different chemically, it should be very relevant to what you are doing and you say you are using Halfords Lacquer, which is intended for cars though many use it on models. If you scroll down through the list of various problems associated with this type of lacquer/paint you will find a section that deals with 'Cratering' which you say is your problem ?? Having read the stuff myself I would say that you maybe need to make sure that your surface that needs to be lacquered is free of dust, oil, solvents, etc. and needs to be thoroughly cleaned before you spray. Are you using any Lint -Free gloves when handling the parts or just bare hands ?? If not I would advise you to always use gloves when handling them and clean the parts well, as a lot of natural oils can be left by your fingerprints which, if not cleaned off can then cause this cratering when oversprayed with the lacquer ?? If you are using rubber gloves it could be that they have a silicone content to the rubber which according to the website, is the worst thing you could use as the silicone will definitely cause the cratering !! It could also be the case that the lacquer is reacting with the solvent in the 'Micro-Sol' Decal solution, so I would at least give the parts a wipe over with a dampened cloth to remove any solvent residue on the surface ?? You might find that by gently sanding (or flatting) back the lacquer you have already sprayed, then thoroughly cleaning it, and then spraying a fairly thin coat of fresh lacquer over the top will solve the problem, as the 'New' lacquer shouldn't react with the older hardened coat, PROVIDED you have cleaned the parts thoroughly after sanding with warm soapy water ?? Spraying 'thick' coats of the lacquer should always be avoided as that can also cause cratering according to the website, so several thin coats would be best methinks ?? Hope that helps ??  Regards ... Kev.
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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ARRRRH !! even after a sanding the body craters are still there  . Only used Halfords as Warty advised on he's build, not using rubber gloves either.. On my 3 replacment issues 1&2  Don't no what to do next, other then try another can of paint in case its faulty. It does look like a silicone effect tho, as the clear lands you can see them starting to form the craters but you would think after sanding the dam thing and re-spraying it would be ok.
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Rank: Elite Groups: registriert, Registered Joined: 20/03/2011 Posts: 2,356 Points: 7,122 Location: UK
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Can you post some pictures up? It sounds like there is something in the air or something that is getting on the wing to disperse the lacquer..
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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I'll take some later, just dont understand. Like I said the front wheel assemble went without a hitch and looks cool. Thanks for the input guys
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