help : paint not drying

[decora]

so i used paint stripper for the first time. no instruction of how long i should leave the stuff on. anyways i left it on until almost all the paint peeled away. gave it a rinse with water - i didn't use soap, sanded a few high spots, rinse (no soap), towel dry and left it overnight.
next day i sprayed some window cleaner and wiped it down. sprayed my primer in the morning and left it in the sun (its around 35 celcius here all day). checking every hour until night fall and there's some large spots that won't dry. the whole chainstay wont dry.

any ideas why?
sand and start again?

 

[Wildcat]

I've had that happen when the paint wasn't the same temp, it was in the house right before I started painting. Now I make sure the metal, paint, and air are all the same temp.

 

[Long&Black]

I'm thinking high humidity might be the culprit.

 

[Highridah]

what kind of primer plastikote is known for these problems.


could be a bad reaction or improper mixing

 

[decora]

i've painted a couple of bikes in this weather with no problem. some parts painted under the shade before moving it under direct sun. a week ago i used the same rattle can for the fork, dries beautifully.

 

[decora]

what kind of primer plastikote is known for these problems.
could be a bad reaction or improper mixing

its rattle can, made by same company and i've used their primer, color, clear combination without a problem before.

could it be the frame?

 

[Highridah]

what kind of primer plastikote is known for these problems.
could be a bad reaction or improper mixing

its rattle can, made by same company and i've used their primer, color, clear combination without a problem before.

could it be the frame?

nah on occasion theres usually a bad can

 

[decora]

nah on occasion theres usually a bad can

thanks. i'm very sure i can rule out the cans, any other explanation?

 

[Highridah]

oil on the metal i wash my bikes with engine degreaser before paint

 

[B607]

I'd bet it was the window cleaner. Use laquer thinner instead of window cleaner. If you can find it, a product made by PPG called Acryli-Clean DX330 works really well for cleaning parts just before painting. Gary

 

[icyuod2]

oil on the metal i wash my bikes with engine degreaser before paint

oil/grease/something that doesn't dilute in water?

did you shake the cans well? ( and continue to shake the can while in use?)
when you start spraying, is the nozzle pointed at the bike or beside it?

sounds like you've trapped some of the propellent under a layer of paint.
ie nozzle pointed at the bike sprays clear first, paint starts flowing and dries rapidly due to the 35*temp, trapping propellent under the paint. cause its no longer exposed to air, it's taking a really long time to gas off.

i use windex all the time for degreasing bikes. never had an issue.

 

[decora]

I'd bet it was the window cleaner. Use laquer thinner instead of window cleaner. If you can find it, a product made by PPG called Acryli-Clean DX330 works really well for cleaning parts just before painting. Gary

auto stuff are expensive here especially PPG. I'm not in the US but i'll keep this in mind, thanks!

oil/grease/something that doesn't dilute in water?

i think this could be my answer... come to think of it i ran into the same problem with this bike's fork 2 weeks ago. same procedure but a 4 inch strip wasn't sticking paint.

did you shake the cans well? ( and continue to shake the can while in use?)
when you start spraying, is the nozzle pointed at the bike or beside it?

yes to all of the above. nozzle pointed at an angle.

sounds like you've trapped some of the propellent under a layer of paint.
ie nozzle pointed at the bike sprays clear first, paint starts flowing and dries rapidly due to the 35*temp, trapping propellent under the paint. cause its no longer exposed to air, it's taking a really long time to gas off.

i've oversprayed a frame before in rage mode, it was pretty thick and it dries up in the next 30 minutes in these temp.
to be honest i was in a rush to get this done since i know i'll be stuck with work for a few days. but i've done 2 primer, 3 colorcoat in less than 2 hours in these temp before (i can paint at night and it will dry!). And i've been painting something every weekend.

i use windex all the time for degreasing bikes. never had an issue.

mine is Kiwi Kleen Glass, used it on all my paint work without problem before.

alright guys, i'm staring at the frame right now and its been more than 48 hours and some spots are still WET! i'm sanding the wet spots and try to feather it out. Was staring at paint peeling , then staring at paint drying ... just one of those days! Thanks guys for your input.

 

[scrumblero]

when its gets that screwed up, it usually best to just strip it off and start over.. :roll:

 

[mikesbikes36]

after strippin and sanding ....i was off wit water ...when im about ready 2 prime i wipe the whole thing down with mineral spirits ..let that dry for about 10 minutes ...and prime works pretty good so far!!! mike

 

[Road Master]

Just before painting I wipe the whole thing off with lacquer thinner - dries quickly, use very little, fairly inexpensive, no residue and cuts any kind of grease quickly.

 

[old school 64]

Don't know if this helps or not, but my painter guy in my shop (heavy haul trailers) sprays the smaller parts down with brake cleaner before he primes the material, and this seems to get all the grease and oils off .. he swears by it and we get alot of grease and oils from the equipment we haul..and all the welding we do..

 

[decora]

mineral spirit, lacquer thinner and brake cleaner and a few suggested above. Thanks guys!

FYI, mineral spirit and lacquer thinner could be identified with a different name unless I can go to Ace HW at the capital city (1 hour drive). These 2 stuff is a sure brow raiser in my local hardware store :lol: .Brake cleaner is a lot more easier to find.

Been looking gloomy and been pouring these past 2 days. good time to do some sanding.

 

[theVULTURE]

after strippin and sanding ....i was off wit water ...when im about ready 2 prime i wipe the whole thing down with mineral spirits ..let that dry for about 10 minutes ...and prime works pretty good so far!!! mike

+ 1 :mrgreen:

 

[vibr8shun]

Just make sure if you use the various cleaners as listed above, DO NOT USE brake cleaner to prep before welding. If there are trace amounts of it on the metal as it mixes with argon and high heat, you will create phosgene gas which is a nerve toxin. Brake cleaner contains hydrogen chloride. RR member Kingsting passed this article a while back... http://www.brewracingframes.com/id75.htm
As long as your not welding, then you're all good Carburetor/choke cleaner is my choice for hard to reach areas but prefer acetone or denatured alcohol overall.

 

[Road Master]

If you have a local Lowes, Home Depot, etc. Lacquer Thinner is a real common product in the paint department. When looking for Mineral Spirits think Paint Thinner.