Fastening Exhaust Hose

[P69]

What kind of "thing" should be used to secure the exhaust hose? I am reinstalling/rerouting the hose and I'm not sure what to use to secure it. More specifically, I know what to fasten into on the boat, but not what to use to wrap around the hose. The hose moves a lot when engine ins on, so chafe is an issue.  Should the fastenings allow for movement or should fasten as rigid as possible?

Thanks

[Rudderly Confused]

Mine is secured with 1" webbing straps, which are attached to various points in the boat with a screw and washer.  The webbing is not super tight, so they allow for some hose movement, but I don't see any chafe on the straps or hose.  It's a 1978, and the straps appear to be original.  My fuel fill hose is secured the same way.

[P69]

I made some exhaust brackets that meet the following criteria:
   1. Will not chafe the exhaust hose
   2. Will hold hose firmly, preventing shifting/vibration
   3. Easy to open the bracket inspect and replace exhaust hose
   4. Can be securely fastened to parts of the boat where hose is routed
   5. Inexpensive
   6. As much as possible, will not corrode

I could not find anything that met several of these criteria, so here is what I came up with.  Like most of my ideas, it started with a cardboard model.

These brackets are made with two parts, upper and lower. I made one-time-use cardboard molds for the upper and lower parts. Essentially, I laid fiberglass (combination of CSM and 1708) over  half circle length of PVC pipe that was near the diameter of the 2" exhaust hose.  This was done inside of a cardboard tray to create the shape of the 'ears' at the ends. 

After the first layup was cured, I back filled the lower part with epoxy/1708 to form a solid substrate to tap for the 1/4" bolt (polyester is not strong enough/too brittle to tap).

These layup trays were about 18" long and they produced two 18"  long pieces (sorry, no pictures of the that part of the work), which I sliced into 1" segments to form the brackets; like slicing a loaf of bread.

The second step was to create the lip under which the top clamp is inserted.  The lip had to be part of the lower half and have a snug fit with the removable part. I used packing tape to isolate the upper/removable part from the lower/fixed part, then glassed the two together on the end opposite of the two will be bolted together. After resin cured, I separated the two, cleaned off the packing tape, then ground it smooth. Now I have  two parts that fit perfectly together. 

The fixed part is glassed to the hull, bulkhead, or wherever the hose runs to securely fasten the hose.  U just slip one end in the  and insert the bolt, then tighten it down.

I lined both halves with 1/16" neoprene for chafe protection. The neoprene is fastened to the brackets with epoxy. I tried 3M 77, but the pads moved under pressure. The epoxy worked well.

More pictures:
http://bodylens.com/Gallery/thumbnails.php?album=49