Bicycle Mechanics - kilz primer...rough finish?
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10-16-07, 06:51 PM
hey peoples. ok here's the thing..im in the process of repainting my frame and forks and i have a question for anyone that may have experience using kilz oil-based primer. following the instructions to a tee..i sprayed on three light coats of this stuff (primer) on my frame and forks. i waited 20 minutes to allow the primer to dry between coats. what i noticed after the final coat dried is that the primer has a rough, textured finish to it. is this the way it's supposed to be? am i supposed to sand the primer to a smooth or semi smooth finish before spraying on the paint? or will the paint cover up the "roughness" and leave me a smooth finish? iv'e followed instructions that others have posted on painting frames..but none state that the primer needed to be sanded before painting. the can of primer doesn't say to sand before painting either. the paint i will be using is rustoleum gloss enamel followed by a couple of coats of clear coat. any suggestions, ideas or comments are greatly appreciated. thx.
I've never used Kilz on anything but home related painting jobs. Great for sealing knots in wood or water stains in drywall.
At this point I would get yourself a piece of scrap to test your process on before proceeding to your final project. :)
10-17-07, 03:59 AM
The top coat won't be any smoother than the primer surface. If it was my bike I'd sand it smooth and, if it looked like any bare metal was showing, spray a more conventional primer coat over it.
10-17-07, 04:25 AM
Kilz is for drywall and woodwork. It's not formulated to bond to metal and doubtful that it would have very good properties for use on bikes. Sand it off and use a good metal primer.
10-17-07, 10:23 AM
Why Kilz - did your frame have mold or mildew?
10-17-07, 10:40 AM
actually the frame is in very good condition. its just that the original paint had alot of scratches on it. the only reason i chose to use kilz oil based primer is because a guy wrote up a how-to column saying he used it and got really good results. he paints bikes as a hobby so i figured he knew what he was talking about. unfortunately i cannot remember where i saw the column so i can't ask him about the grainy finish. well ill just sand it down and try using something else. thanks again for the feedback.
You should have used POR15. Strip it down and do-over.
If the textured finish looks like “crackle finish” the paint isn’t compatible, you would need to strip it all off and use the correct primer & paint.
It's probably over-spray.
When the paint particles floating in the air settle on the drying paint it feels slightly rough to the touch when dry. For colors it can cause dull or hazy areas while some areas look nice and glossy.
Since it’s just the primer coat you could sand it a little (you want a little roughness for the paint to adhere) or just clean and paint the color.
Try to spray next to fan pulling the over-spray away from the drying paint.
kilz is pigmented shellac. go to an auto parts store and get a sandable primer.
10-18-07, 09:07 AM
yup..found out that if you spray with the can a little too far..the primer will actually start drying in mid air before it gets to the frame. so you get little droplets of semi dry primer giving a rough texture. ill take your advice and get a more suitable primer. just have to wait since the weather out here in cali just got a little wet. thanks again for the help. really appreciate it.
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