Official Luthiers Forum!

Do I or should I buy the SM vinyl strip or is there another way ? Can the binding and purfling be put in together?

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Hutch

Get the heck off the couch and go build a guitar!!!!

They can be put in together, but you should bend the herringbone first. It is not as flexible as thinner lines are.

Check out Dan's very simple jig for doing tight bends in herringbone.

https://www.youtube.com/watch?v=xU7JYMZ9cGY

Do I really need to do that for a dreadnought?

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Hutch

Get the heck off the couch and go build a guitar!!!!

For a "normal" guitar I soak the herringbone for about a minute (not too long or it will fall apart !) and it becomes pliable enough to wrap around the curves of a guitar. For a Venetian cutaway or soundhole purfling Dan's method would be better.

Definitely not necessary for a dreadnought.

I've done herringbone purfling on the tighter curves of a parlor guitar without any problem. I fill a large baking sheet with hot tap water and then submerge the purfling in the water for 90 seconds. I then take the two pieces out of the water and tape them together (stacked) and then tape them to the side of the guitar body and leave until dry. That works fine for a parlor guitar and is trivial for a dreadnought.

Here's an example of two pieces of purfling taped together after having been bent by that method.

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Once in a while you get shown the light in the strangest of places if you look at it right - Robert Hunter

Good news, StewMac sells the Herring Bone purfling pre-bent.
Under $13 for a set of two.
Yes, you glue the bindings and purflings in as a set, at the same time. Get some StewMac Bind-All while you are ordering, if you don't already have a plastic to wood adhesive. DUCO cement is similar, but its clear and you can see it. BindAll is white. I would practice using the Bind-All, its wicked messy and sets up in 60 seconds or less. I would also dry run adhering the binds/ purflings. Also, I cut the end off a plastic pipette and affixed it to the tip of the Bind-All.

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Measure Twice,

Karl Borum

Re-read your OP. I don't think I understood your question...

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Measure Twice,

Karl Borum

By "vinyl strip" do you mean a teflon strip? If so, you don't need that. The binding and purfling can be installed together at the same time.

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Once in a while you get shown the light in the strangest of places if you look at it right - Robert Hunter

Nah... Not for a dred. Might still want to use some heat in the upper bout curves but again, I have not done it before tho I have some herringbone in waiting.

Let me know how it works