A problem with spray paint

BillDL

Kalimna said:

........ The only insight required would be a little more clarity from your luthier in their application method.

GoldenEraGuitars

Kalimna said:

SteveRobinson said:

Hilario73 said:

It’d be great if the test results could be shared here eventually so we can gain some insight into what might have happened. 

Everybody but you can see what happened.

Steve, I have used many of your cans on a completely hobby basis, and have only ever had user-error issues with an otherwise faultless product/service. I have completed around 6-7 guitars (including bursts, Tyler-burning-water, flip-flop and metallic), and even I can see the too-close, too-much-paint drip/run on that Explorer - I've done it myself many times. The only insight required would be a little more clarity from your luthier in their application method.

That’s actually a good call. For parity we should be able to see the luthiers other tests he did. 

OzzyLister

Hi guys, here is the test. Just for clarification this was done over a polyester primer and this is not a demonstration of the correct technique, nor was the intention to try and do a burst. In fact the aim was to try and get the paint to "pool" or "spit" but as you can hopefully see it does neither.

I'd just like to add if anyone does have a problem with Manchester Guitar Tech nitro please don't hesitate to contact me and I'll do whatever I can to help. If you want to share your work with me I'd love to see it too! guitartech@manchesterguitartech.co.uk

Thanks again for everyone's input.

davros

Looks like the video link has broken after an edit (the forum does that). Can you post again?

OzzyLister

Apologies, I just need to figure out how to post the video...

OzzyLister

          

davros

Looks ok to me, and with many more passes than I'd normally be comfortable with in one go too

BillDL

I think that part of the issue with the guitar that is the subject of this thread is that it has sharper radiused edges to the body.  If you are spraying just as you move the can across the body with each pass there is a tendency for the edges to catch more of the spray and stay wet for longer than the areas in the middle of the guitar.  That can easily lead to a build-up and runs or sags if you are not careful, and it's not always immediately apparent that it is beginning to happen until it does, then it's too late and needs to be left to dry for quite a long while before it can be sanded back.

It's similar to applying a metallic flake colour coat over primer.  You need to mist it on quite finely so the flakes orient themselves randomly.  When it comes to the first coats of clear coat you need to do a fine dryish mist spray or two to hold the fuzzy flakes in place before you can then go on thicker.  If you allow those first coats of clear to go on too wet it will start dissolving the lacquer holding the metallic layer and allow the flakes and colour to merge together then sag, and you get a pooling of lacquer that's a different appearance.  If your colour coat isn't metallic glitter the first clear coats can still "pick up" the tint if the clear is too wet and cause it to pool in areas of darker tint.  This is especially so at the edges of guitar bodies.

davros

Literally had this happen on my current build. About 5 light coats over the metallic Pelham Blue, then Accidentally a little heavy in a couple of places on the 6th and the flakes reoriented and look like dark patches.

Not enough to sand back and start again but annoying, and entirely my own fault.

GoldenEraGuitars

OzzyLister said:

          

Bang on fella.

Is it ok to stop tiptoeing around the issue which is user error? 

BillDL

I was really annoyed at myself on one body that I had hung in the shade inside my open garage door and stupidly allowed it to be hit by the full glare of the sun as it moved and shone right down my driveway onto the body.  The solvent vapour underneath expanded rapidly and was encapsulated in the rapidly drying upper coats, where it very rapidly developed a rash of pustules like a plague victim.  I had to sand it back and buy more lacquer, but I got a really nice result despite the set-back.  The very slight metallic blemishes from being too "wet" with clearcoat have actually faded out now and you need to scrutinise it closely to see them, whereas they were more obvious in the weeks after I had finished.

https://www.thefretboard.co.uk/discussion/271067/finally-finished-my-tele-build-metallic-lacquer-content/p1

Sporky

GoldenEraGuitars said:

Bang on fella.

Is it ok to stop tiptoeing around the issue which is user error? 

I think there's only been one person in the thread who thought it wasn't user error.

I doubt anyone here would risk selling them anything given their behaviour here. 

GoldenEraGuitars

BillDL said:

I was really annoyed at myself on one body that I had hung in the shade inside my open garage door and stupidly allowed it to be hit by the full glare of the sun as it moved and shone right down my driveway onto the body.  The solvent vapour underneath expanded rapidly and was encapsulated in the rapidly drying upper coats, where it very rapidly developed a rash of pustules like a plague victim.  I had to sand it back and buy more lacquer, but I got a really nice result despite the set-back.  The very slight metallic blemishes from being too "wet" with clearcoat have actually faded out now and you need to scrutinise it closely to see them, whereas they were more obvious in the weeks after I had finished.

https://www.thefretboard.co.uk/discussion/271067/finally-finished-my-tele-build-metallic-lacquer-content/p1

A bloody good sanding down with 320 grit can solve a lot of cock ups, and trust me.. I know lol

One of the nicest things when spraying is when a metallic has been scuffed down for more clear coat, the before and after is so drastic it’s great to see it gleaming again.

BillDL

Yeah, that is the moment of truth and satisfaction as it begins to gloss up and shine again.