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Posted (edited)

For those looking to undertake spray painting in the Winter months PPG's tech tip:

Cold Weather Clearcoat Curing Tips

Cold temperatures can have a significant impact on the curing of urethane coatings. As temperatures drop, the curing process slows down and can even stop when temperatures drop below 60°F in your shop. These conditions can result in a finish that may eventually dry, but will exhibit reduced durability, gloss, and repairability. Therefore, it is important to ensure your products, your substrate, and ambient spray temperature are all above 60°F to insure proper curing of your paint film.

Before you begin painting, remember these tips:

  • If you store your products in an unheated area, make sure they are brought in to warm above 60°F prior to mixing.
  • Make sure your ambient booth temperature is well above 60°F.
  • If the car you will be working on has been sitting outside or in a cold shop, make sure it has been given time to warm in the booth to raise the metal temp above 60°F.

Remembering these tips as temperatures plummet will help to ensure a successful paint job!

 

Epoxy Primers and Cold Temperatures

Epoxy primers are great to provide adhesion and corrosion protection to bare metal substrates and are especially popular among custom car builders and restoration shops. However, low temperatures can slow down the curing time of epoxy products, and with winter fast approaching it’s important to take extra care when temperatures drop.

Keep these suggestions in mind when using epoxy in colder temperatures:

  • Allow for extra cure time if your booth is below 70F. Temperatures below 70F can slow the rate of cure of the epoxy so it's important to wait some extra time before applying your next layer.
  • Make sure your products are stored in a warmer environment. Just like your booth temperature being too cold, epoxy products that are too cold can cause slow cure as well. Warm your products to 65-70F before mixing and spraying.
  • Apply heat if possible. Epoxies love heat to cure and a warm booth and metal temperature will ensure your products are performing their best. Maintaining this warm environment after the job is sprayed will also help ensure the coating cures properly.
Edited by AndBir
added primer info

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