Dengie do a feed that several people I know use and swear by called Healthy Tummy it's not cheap but definitely works. There is also a study that found supplementing 45ml corn oil significantly lowered gastric acid output and increased prostaglandin concentration leading the authors to conclude...
I've had a horse that the vet used adhesive allevyn and another used a adhesive primapore (both like plasters) with a special kruuse adhesive spray that made the dressings stick extremely well. Highly recommended!!