I picked up one of the Refina 14in jobs last week and used it for the first time today. In IMHO they are to flexible to flatten **** all in, and when I put a steel trowel straight over the area that I'd just used the plastic on the shape wasn't great. However I was using the new Thistle Spray Finish and the plastic certainly does trowel it up nicely late on in the set and as there is so little friction, I could see me using a larger one without it putting to much strain on my already aching arms.I use a 14 not sure if you'd get misses with the big ones there a bit too flexible
we got that plastics a few days before we started using the spray. We finished a house with multi then started the next with spray finish by hand.How do you know you only use it on the final trowel then ?