[JohnB]

I didn't take it as a knock, I just wanted to make sure what materials your using.

IMHO, if your doing layers within 24 hours you don't need to sand. What I do is take a grinder or small roto grinder, and knock any of the high spots or strands back, since they stick up, and cause an air pocket in the next layer. That is something you don't have to deal with when hot coating. Generally, I will rough the surface up with the grinder, just the high tops, not grind into the fabric between coats.

I wasn't trying to make a federal case about it, and putting down 2 layers at a time saves time and resin. I tend to make the first layer a little less hot with the catalyst, and then make the second layer standard ratio. I try to do it when it is under 70 degree, and in the shade, and have less problems.