We are painting a 48' trailer with Oneshot and were using high temp reducer with no problems. But then the weather cooled down and it got very humid and overcast. I switched to penetrol (don't ask me why)and painted on a coat about 2PM. the next day, the finish had "blushed" and on closer inspection, was rough like 220 grit sandpaper. Well, the rain and humidity was done anyway and it got hot again so I switched back to hightemp and coated over it. But it still ain't glossy.
What did I do wrong? Thanks
Posted by Ray Rheaume (Member # 3794) on :
Not sure if this helps, Wayne...
Although the outside temperature may have improved, the trailer may have stayed cool on the surface longer.
On the flip side, if the temperature INSIDE the trailer stayed warm on the rainy day, it will tend to dry backwards. (Can cause bubbles, lifting and worse.)
I know it sounds like a simple solution, and might not be on the mark in your case, but I make it a habit to open a door when workiing on trailers. That way the temperature stays equal inside, outside, and on the surface.
Hope this helps... Rapid
Posted by Bill Preston (Member # 1314) on :
Not sure you did anything wrong, Wayne. Don't think penetrol was a factor.
Most likely the high humidity/cooling temp played the biggest part. As temp dropped probably dew condensed on the still-wet paint. Have seen this happen before---don't ask what I was painting when I found this out. At least it wasn't for a customer.
Equalizing temp inside and out is a good idea--but I don't think it would have made any difference in this instance.
Sanding/repainting may be your only option.
FWIW
Posted by old paint (Member # 549) on :
the blush comes from paint not being dry when the temp goes below 60 and their is dew or high humidty.being in fla since 81 ive done this more then once but have learned a few ways to prevent this. if you can put up a tarp over the painted area to keep off the moisture. dont paint past 4 pm....this will give your paint a couple hours to flash a skin coat on the paint, then the dew wont hurt it. move the vehicle next to a building or under trees. penatrol wasnt the problem. put a couple of those 500W work lights on the painted area....for about 4 hours as it starts to cool down the worst one i ever had was a plumbers truck, it was tan with maroon lettering....and i finished it this time of year, about 5:30 pm was gettin dark and i left it sitting in the open. next morning i got up all set to get my paycheck $400, and i had to repaint the whole damn thing it blushed so bad!!!! and it never did come to full gloss.
[ November 21, 2003, 02:34 PM: Message edited by: old paint ]
Posted by Wayne Webb (Member # 1124) on :
Thanks guys, The humidity, damp weather and cool temp must have been it.
We painted again today with a little hightemp reducer and it's starting to gloss again.
thanks again
Posted by Jillbeans (Member # 1912) on :
Hi Wayne... Be careful if you use big work lights at night...you might get a "skeeter" effect on your paint! Man, they are worse to get off because their little legs get stuck in the paint. Love- JILL
Posted by old paint (Member # 549) on :
jill we just leave them skeeters in the paint till it dries....then they come off easier..and a Q-TIP with a little paint......never know it was there....
Posted by James Donahue (Member # 3624) on :
I'm totally with you guys about the dew and moisture, but are you sure the penetrol wouldn't slow down the drying time a little, thereby leaving the paint more vulnerable to damage?
I like Penetrol, need to make a post about positve results, but oh well, maybe tomorrow.
