So, in summary, the professionals have their own preferences and workarounds. But if you’re new to this kind of job, it’s generally worth using scrim tape for a flat surface and joint tape for an angle.

Paper joint tape is a strong kraft tape designed for using with jointing compounds to reinforce and strengthen drywall joints and corners. Retains strength when wet, with tapered edges for invisible seams and strong crease in centre for an effective fold.

Taping drywall can be a daunting task if you don't know the correct techniques. Get the tape coat just right and you're sure to have smooth drywall joints

Finishing Outside Corners: Use broad knife to apply the joint compound over the corner bead flange for the outside corners. The first coat should be approximately 6" wide, and the second coat 6"- 10" wide applied on each side of corner. Getting the right materials for any job is vital. Fortunately these days it’s not hard to find just the right quality product, designed specifically for the task in hand. ItemThumbnailImage": "//sherwin.scene7.com/is/image/sw/paint_template-1?layer=comp&wid=250&fmt=jpeg&qlt=92%2c0&op_sharpen=0&resMode=sharp2&op_usm=0.0%2c0.0%2c0%2c0&iccEmbed=0&printRes=150&_tparam_layer_1_src=sw/SW08100297", With such a specific purpose, you need to have the right circumstances to use this tape – there’s little point using it on a flat joint due to the two strips of thin steel embedded into the trim. This is what helps to create a crisp, clean finish on external corners and ensures a sharp line on all angles.

Apply the paper joint tape to the wet Jointing compound">jointing compound starting with the outer corner and working from top to bottom. So how about jointing tape? Jointing tape is made from paper, which has its own pros and cons. In practice, many professionals still prefer it for most jobs as it’s cheaper and comes in larger quantities so it’s convenient to have on hand for a range of jobs. But it’s a matter of preference.Basically, for plasterboard joining you’re looking at using either scrim tape, or jointing tape. There are good reasons why either of these can be your perfect choice, depending on the circumstances, and of course there are often ways around it if you need to use the other. Let’s look at the difference between the two. Make sure you don’t remove all of the joint compound from the surface as you smooth it out. Joint tape needs a base layer of joint compound to adhere to the drywall. Just try to get rid of lumps and bumps in the joint compound. Apply a layer of joint compound on top of the seam you want to tape over. [2] X Expert Source James Mansfield