I’m a terrible painter

Irie308

Irie308

Well-Known Member
May 28, 2013
2,593
CT
Boat Info
2004 420 DB, GHS Hydraulic Lift
Garmin 8600/Garmin 1222 plus
AB Mares 10 VSX with 30 hp Tohatsu
Engines
Cummins 450C 8.3 L Turbocharged
Admittedly I hate painting however ive cleaned and primed my aftercoolers before painting. Using the two rustoleum products pictured. It took the primer fine but when I painted with the top coat “canvas white“ I’m getting the bubbling only in certain spots. Any painters out there that can tell me what I’m doing wrong. This is the second coat and Ive sanded the bubbling that popped up on the first coat.thought this would be the easy part:(

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the solvent in the new paint blistered the original paint which was probably water base
 
Most spray paint must be recoated within 1hr or so OR after 48hrs. Like mentioned above, the solvent in the paint is reacting with the not fully cured first coat.
 
I have never used a primer on bare metal .... You are in salt so maybe your looking for extra protection. I also use Cummins paint at a stupid price. Never had a problem if everything is clean
 
Looks like a chemical reaction. I’ve seen this on original paint on cars but not as thick. The culprit in autos is the solvent based paints ( clear coat ) over water base ( base color coat ).

If you redo it make sure all paint and primer is removed and clean any oil or chemical residue before re spraying. Good luck.
 
Thanks for the insight. Going to have them stripped bare then repaint.
 
I feel like you're missing an opportunity for a few extra horsepower here. Canvas white? It's widely know that throwing some bright red, electric blue or maybe high-vis yellow on engine components will provide better performance and efficiency. :)
 
What you are seeing is called "lifting" where the finish coat is causing the primer to lift off the surface. Could be from any number of reasons but most likely from the primer and the top coat not being compatible. Without seeing the label on both cans, my guess is the solvent in the top coat is a "hotter" solvent than the one in the primer so it dissolves the primer, then since the solvent base in the top coat is hotter, it dries quickly after it wrinkles up the top coat. I've had it happen any number of times and learned the hard way to buy the paint and primer from the same automotive or industrial paint store, use the recommended reducer, then follow the application direction very carefully.

From where you are, you are doing the repair correctly.....i.e. strip it and do it over.
 
You learn something new every day from the this brain trust we call CSR. I'm going to have them stripped and start fresh. Looking at the powder coating option as well. The head scratcher for me was why only in certain spots. I thought maybe i left some dirty spots or something. Like i said I hate painting but this canvas white is a very nice match to the color of my motors. I'm planning to use it for touch ups. What would be the recommendations for dealing with rust spots etc on the motor? Wire brush then lay on the canvas white without any sort of primer? Also wipe down painted surface with a mineral spirit?
 
Irie308 said:
You learn something new every day from the this brain trust we call CSR. I'm going to have them stripped and start fresh. Looking at the powder coating option as well. The head scratcher for me was why only in certain spots. I thought maybe i left some dirty spots or something. Like i said I hate painting but this canvas white is a very nice match to the color of my motors. I'm planning to use it for touch ups. What would be the recommendations for dealing with rust spots etc on the motor? Wire brush then lay on the canvas white without any sort of primer? Also wipe down painted surface with a mineral spirit?
Click to expand...
Mineral spirits leaves a residue. Use alcohol or acetone.
 
I just did both engines. Wire brush and clean with acetone then apply ospho to the bare metal then paint with the canvas white. I actually also add hardener to the paint was well.
 
I use the Canvas white on my Cummins. I never use primer. I go right with the canvas white. I do what the can says. I put multiple coats on, waiting just a few minutes between coats. Never had it flake off.
 
NotHerDecision said:
I just did both engines. Wire brush and clean with acetone then apply ospho to the bare metal then paint with the canvas white. I actually also add hardener to the paint was well.
Click to expand...
That’s the right way to do it. Adding hardener is the only way your going to get s durable Finish.
 
When touching up rusted metal bolts and such treat first with Corroseal. Its a metal surface conversion coating that kills corrosion and is ready for top coat, Works great! I like to use Epoxy Appliance paint if I'm just rattle-canning it doing engine touch up painting.
Carpe Diem
 
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