I don't think it's a climate issue. The sealant cracks from the leather being flexed. The sealant is flexible but less so than leather so when the bag is used and the leather stretches and flexes the sealant gives way and cracks.
Leather sealants are resin and/or soft acrylic. Lubriderm and stuff with oil can make it worse because oil lifts it sort of the way that peanut butter can help get a wad of gum out of a kid's hair. Most glues would also be bad because they dry less flexible that the sealant and then everything cracks more.
I've had good success with an acrylic based clear glaze used for craft projects that I got from Michael's craft store. I took a thin tipped artist brush and carefully flowed the glaze on the cracked sealant. It filled in the cracks and rebonded the original sealant so it no longer was about to flake off. Dried flexible too. I had to look really close to even see the original cracks.
I don't know if the product I got was the best solution, but I think going in the direction of flexible acrylic/resin glaze is best. Also, if you google leather edge sealer, there are specific products like Fiebing's Edge Kote or Enamel (they make a colorless version). I keep meaning to order one of these to use the next time I see some cracking on one of my bbags. Since I can't match the bag colors, I want to make sure I reinforce or patch the cracking sealant with a clear coat before any color flakes off.
Leather sealants are resin and/or soft acrylic. Lubriderm and stuff with oil can make it worse because oil lifts it sort of the way that peanut butter can help get a wad of gum out of a kid's hair. Most glues would also be bad because they dry less flexible that the sealant and then everything cracks more.
I've had good success with an acrylic based clear glaze used for craft projects that I got from Michael's craft store. I took a thin tipped artist brush and carefully flowed the glaze on the cracked sealant. It filled in the cracks and rebonded the original sealant so it no longer was about to flake off. Dried flexible too. I had to look really close to even see the original cracks.
I don't know if the product I got was the best solution, but I think going in the direction of flexible acrylic/resin glaze is best. Also, if you google leather edge sealer, there are specific products like Fiebing's Edge Kote or Enamel (they make a colorless version). I keep meaning to order one of these to use the next time I see some cracking on one of my bbags. Since I can't match the bag colors, I want to make sure I reinforce or patch the cracking sealant with a clear coat before any color flakes off.