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View Full Version : time on label vs actual drying time?



SinCrisis
09-24-2009, 10:39 PM
Hey guys, ive recently starting painting using krylon fusion. The label says that recoats are within 24 hrs or after 7 days. Does this mean i really need to wait 7 days before recoating if i miss recoating it in the first day? Ie, painting it on day 4 or 5?

Liquid_Scope_99
09-24-2009, 10:56 PM
I would to wait the 7 days to make sure because i have painted outside the recommended time and have coat three bubble under coat four and that sucks.
Good luck

nevermind1534
09-24-2009, 11:07 PM
If you don't do it in the right time frame, it can turn out pretty bad.

SinCrisis
09-24-2009, 11:22 PM
I had tried to recoat in only 2 days and parts spider webbed like crazy. Looked cool but i had to sand that down. Ive had it sanded smooth for about 4 or 5 days now. Im guessing the parts that spiderwebbed was where it hadn't dried properly before the second coat? However it was the aprts that spiderwebbed was only about 40% which leads me to think that after 4 or 5 days it should be ready. I will wait another 2 days before painting. thanks

slaveofconvention
09-25-2009, 11:11 AM
I can't say for definite if the following applies to that particular brand of paint, but generally speaking, it fits so...

Paint forms a thin crust fairly quickly but it takes longer for all traces of the thinners which evaporate out during the curing process to disappear. If you recoat quickly enough, the new coat will re-soften the first coat crust - allowing the thinners to pass through safely and without damaging the finish. If you leave it the full curing time, the process is complete before the next coat goes on. If you go between the two, the first coat crust is too hard to effectively re-soften so it'll crack or bubble under the stress of the thinners hitting it from both sides at once - these cracks will carry through to the top coat which is why you end up with problems which can only be fixed by sanding down to the original coat (which will be fully cured).

The people who make paint test it pretty exhaustively - I think you're fairly safe listening to what they say instead of hoping there's wriggle room....