How do I apply decals to irregular surfaces?

This is not as difficult as you would think.

Normally you would dip your transfer in warm water to help remove it from the backing paper and soften the decal. Although the decal is still quite rigid, this is fine when going on to a flat surface.

But to add a decal to an irregular surface, it is better if the decal is softer. You can achieve this using a product called Microsol. This will soften the decal even further than just water.

Then use a dry paint brush to slide it off the backing sheet and help it to be placed in exactly the correct position. With gentle dabbing, the transfer can be placed in most places.

Once the decal is in place you can use Microset which will help the decal to stay in place and when dry will stop it from being accidentally rubbed off.