Here is a list of posts about making home made holds:
NOTE: see DIY holds and walls page.
Texture is provided by 6 inch, 180 grit, self adhesive sandpaper discs. So far, the discs have stuck admirably well, with the exception of on the curved piece, where the shape prevents us from having sufficiently wide sections. On that section the paper slowly slides down under full load. Another potential shortcoming is that it is likely that the adhesive is temperature sensitive, and might not work very well in the summer. For wintertime bouldering in our garage we seldom have the heat on high enough to worry about the adhesive softening up.
The pipes are a great asset in terms of hold type and in their “feature-ness”. It is great to have a 5ft pinch rail crossing a section of the roof. It allows a more Hueco-type feel for many of the problems, where beta depends on where you choose to use the hold, rather than which hold to use.
I am sure that heavy climbers or extreme dynos could lead to hold failure in gym conditions—but I doubt we will have problems in a home wall, especially because our low ceiling precludes dynos of any size. Obviously—we don’t grab the sharp ends of the pipes. Another reason these holds are good for home walls but not so much for gyms, where you can’t trust folks not to do foolish things.