Sand, caked onto a tightrope suspended 100-feet above the beach, created dangerous conditions for tightrope-walker Nik Wallenda Thursday.

The seventh-generation daredevil walked 1,300-feet without a harness to promote his new show at the Tropicana Casino & Resort in Atlantic City, N.J.

Wallenda, 33, even considered taking off the buckskin slip-proof shoes made by his mother before he began the 27-minute walk.

"It was really uncomfortable, with the fact that as I took my first step on that wire there was a lot of sand on that cable and it was actually pretty slippery, more slippery than when it's wet," he said on "Good Morning America" today.

SLIDESHOW: Nik Wallenda Trains for Niagara Falls High-Wire Walk

"As you know those wire shoes my mom makes are made to grip when it's wet but we don't do anything for sand. So in the beginning of the walk, I actually took one of my shoes off and walked barefoot just to test the wire to see. I was considering going barefoot. I thought it would be fitting being that I'm actually walking over the beach. But I ended up putting my shoes back on and successfully completing that 1,300-foot walk. "

Wallenda walked across Niagara Falls in June. He is planning to walk across the Grand Canyon.