I’d like to put this debate to rest.
First of all, I’m not a professional detailer. My experiences are my own, on my own vehicles. By no means do I have the breadth of experience of a professional detailer.
But for my money… 303 Fabric Guard wins over RaggTopp fairly handily. Why?
First, let’s talk about protection. I’ve been applying protectant to the top of my M roadster as needed for over 10 years now. I’ve used both products, and have twice split them side-to-side (one product on the left half, the other on the right half). If I’ve seen any difference in protection, the 303 has been better. I don’t have a scientific explanation, and I have not taken pictures. However, even if we call this a tie…
303 Fabric Guard is less expensive. By a considerable margin. A 16 oz. spray bottle of RaggTop is around $20. You can buy 32 oz. of 303 Fabric Guard at that price; that’s half the price of the RaggTopp. And if you care about filling up your local landfill, you can buy 128 oz. refills of 303 Fabric Guard. I’ve never seen a RaggTopp refill. I know that some find the RaggTopp aerosol convenient, but I find it useless. The can has to be thrown out when empty, and to me it’s more difficult to use without getting overspray on your paint, glass and plastic window. Especially if you’re using it outdoors on anything but a completely calm day. 303 Fabric Guard can be applied with a paintbrush if you want complete control over its application, without ever buying a spray bottle.
Scent… maybe it’s just me, but I find RaggTopp fairly offensive to the nose. I’d never consider using it on fabric in the interior, but I don’t have a problem using 303 Fabric Guard on interior fabrics.
Availability… I’ve never seen RaggTopp locally. That means I have to pay shipping when I order it. I can find 303 Fabric Guard locally, which avoids the shipping costs.
Buy whatever suits your fancy, but for me 303 Fabric Guard is the right product for a fabric convertible top.