Epoxy Primer Tempature

M

Marcos beltran

I know you are not supposed spray the epoxy primer if you cant keep the tempature to atleast 70 degress for 24 hours. Well what would happen if you spray it under the 70 degree tempature? My door jambs and doors are in bare metal and starting to rust. I will not be painting the car anytime soon, it will probably in the epoxy primer for the next year or so. The tempature will not stay 70 degrees probably for the next 2 months. Will it just take longer to cure or will it not cure at all? Want to know if this will be alright or just rattle can the parts not primed until the tempature warms up.
 
Here is an exact case for you as of last week.
Did car in pieces at different times. only certain pieces are covered with rust under the epoxy. About year and half to date.
Heat shut off at night and weekends,
Monday metal temp could have been in 40s or 50s.
Epoxy contents also cold, first coat sprayed with cold epoxy and over cold damp metal.
Shop now 65 but metal still cold as well as epoxy, second coat sprayed and dried nice as first coat acted as an insulator and shop air 65..
Bottom line first coat never fully cured over the wet cold metal.
So now it can be done the right way.

I dont write these tech sheets and send out 35,000 catalogs a year for fun.
 
Sorry because of deal last week i went nuts and did nort read all of question.
Sorry
Yes you could can spray and strip when ready to work.
But you could leave as is and just as easy to take care of flash rust in spring.
Or rent or buy a lp gas torpedo heater and put the epoxy on, if you do call me for instructions.
 
jlwdvm said:
Have the Tech sheets changed? I think my version says 60 degree minimum temp.
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No because i write the tech sheets, it took all I got just to say OK at 65.

"Bottom line if car temp cannot be kept at 65 or higher for 24 hours don't do it--page 13

It does say if cold Induce for 60 minutes???
 
Barry said:
No because i write the tech sheets, it took all I got just to say OK at 65.

"Bottom line if car temp cannot be kept at 65 or higher for 24 hours don't do it--page 13

It does say if cold Induce for 60 minutes???
Click to expand...

Barry, the 2010 tech manual did say 60 degrees.
 
This is why my freshly primed bumpers spend the night on my living room floor.
(I heard you must be a red neck if a bumper is in your living room)
 
There's at least two reasons to have raised the minimum from 60° to 65°, first is that many people will think air temperature equals panel temperature, which it doesn't usually, and second because there is a lot of variation in thermometers. Most of us that have used the epoxy for a long time know that time and heat are our friends, it really can't be stressed enough. I tend to think that even 65° is on the low side for most refinish materials, especially epoxy.
 
The panel will be very close to the temperature of the air surrounding it in a steady state. Heat will always transfer to move toward a state of equilibrium. Now, introduce heat to the air or panel, and it will take some time for one or the other to "catch up". Test it yourself. Put an air thermometer near the panel and use a cheap hand held IR gun. Temps will be very close.
 
ksungela said:
The panel will be very close to the temperature of the air surrounding it in a steady state. Heat will always transfer to move toward a state of equilibrium. Now, introduce heat to the air or panel, and it will take some time for one or the other to "catch up". Test it yourself. Put an air thermometer near the panel and use a cheap hand held IR gun. Temps will be very close.
Click to expand...
I have to think that this is highly dependent on many factors. In my environment, I have tested it myself, and when, for instance, it's -5° F outside in a poorly insulated building, air temperature does not correspond with panel temperature at all, because surfaces are able to radiate heat rapidly into the extreme cold of the walls and ceiling.
 
In my shop it takes an air temperature of 78-81 degrees to keep the body of a car around 69-72 degrees (thermometer at about 6 feet from the floor)
and I have to use lamps on the lower areas/rocker panels to keep them above 65. It may be silly but I put cardboard down on the floor under the rockers to help 'insulate' it from that cold concrete....according to the ir thermometer the cardboard stays about 3 degrees warmer than the floor.

It's irritating during those times when I leave it that warm for 2-3 days (for epoxy or paint) knowing that its warmer in the shop than it is in my house
and LPG ain't cheap. But then again I am thankful to be able to maintain a constant temperature in the shop, which is a huge blessing.
 
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