My tips:
The more widely available resist, that in most cases can be thinned down with water, gives a compact thick layer that can be pulled off after it is dry. Please take care that no remnants stay behind when vou remove it (it is best to use tweezers), as they leave ugly traces in the firing. Use a separate brush for resist!
Remove the resist straightaway after you have sponged a piece with paint, as otherwise it would become soft again, making it difficult to remove.