Problem with epoxy and Feather fill

M

Marior1995

Promoted Users
Hey guys, I ran into another problem and I haven’t really found another post with a similar situation. So anyways here there issue

after I finished blocking my quarter panel, I sprayed epoxy primer on a 78 day and then sprayed it with feather fill over 4 hours later. Now the epoxy I was using was Transtar brand. I’m spraying out in a car port and at night it does drop to the 40s. So anyways when The feather fill dried it had dried very weird in some spots. It felt soft so I put a heat lamp on it and then the feather fill started lifting. Underneath the epoxy was still wet. This happened in 3 spots. I sprayed this all Saturday and decided to sand these areas and when i was sanding and hit the epoxy, the epoxy was really gummy. Do I need to sand off all the feather fill and epoxy or buy a big heat lamp ?
 
You are going to have to remove it all. It will not dry or get better on its own. Couple of reasons why it happened, first you sprayed poly primer over it too soon. Should have waited at least 24 hours @ 65-70 degrees. Even that would have been pushing it. SPI recommends 48 hours @65-70 degrees before applying polyester primer. Second with temps dropping into the 40's the epoxy literally stopped curing (but if you had already applied the poly primer this is a moot point. )
What you need to do to ensure success is this. Remove the poly and epoxy completely. When you are ready to re-prime you need to make sure you can keep the epoxy above 65 degrees for 24-48 hours. OR move your work into the sun and let it get a full 6-8 hours of sunlight on it. Being you are working in a carport this might be more do-able. Don't let it get below 65 though between the time you spray it and when you set it in the sun. Make sure that when you spray the epoxy your air and metal temps along with the temperature of the epoxy itself (keep it stored somewhere where temps are at least 65 degrees) is above that critical 65 degree mark.
Remember keep it above 65 degrees for 24 (min)-48 hours (ideal) or get the work into the sun for at least 6-8 hours. If you go the sun route give it another 24 hours (after the time in the sun) before applying the poly primer. With poly the temps are not as critical.
 
Alright, guess I’ll go buy a roll of 80 grit and start sanding it down. It sucks but oh well. Another issue is I’m not gonna be able to spray for awhile since the temps are now 61 to 58 being the highs all of this week. I was gonna invest in a bigger heat lamp or a torpedo heater to try to help but being in a car port I really don’t have much options, I just hate to not be able to do anything with my car all this winter again but thank you Chris. I appreciate the response
 
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