Jointing - resin-based mortars

[martinJS1]

I'm refurbishing the patio in the image [image location has a https prefix not http so won't load?] which uses a well profiled Stonemarket slab.

Due to time and ease of use I'd like to use a resin based mortar and would be grateful for views on the following:

1. A recent post by Tony McC stated ‘Avoid any one-part product, they don't last and they fall apart under a pressure washer. Use ONLY a quality two-part resin mortar’. Does this refer to use in a commercial application?

2. Is this type of slab, which has 7 years of weathering, suitable for use with a resin mortar?

3. Other posts on this site refer to rubbish and good quality resin mortars; Jointex and VDW 840+ are frequently mentioned and are used for the case studies, is it safe to assume that these are good quality?

4. The https://jointingmortaruk.com site has Jointex Easy, Rompex Easy and EASYJoint I've had a look but can't find what the differences are between these products, can anyone explain, which is most suitable for my job?

5. Amount required - this may seem like a daft question but is it safe to assume that if I dig 2 x 10l buckets worth of old mortar from the patio then I'll need a similar quantity of resin mortar to do the job?

Many thanks for a superb resource.

[KeburDave]

Easy Joint and 840 +are single part resin mortars, they are not the 2 part epoxy mortars you would want the 850 or 815 depending on the size of the joints. We do use Easyjoint on a lot of our installations and have never had a come back in the last 5 years, however we also use the Vdw 850 and 815 when the customer stipulates the use of these and they are bomb poof but are more expensive!. On standard Sandstone average 10mm joint on 40-50mm depth we get around 10 sq/mtrs on a 25kg tub of Vdw 850 or 6 sq/mtrs on a 12.5kg tub of Easyjoint. If the existing patio has not been laid on a free draining sub-base i.e laid on a concrete base avoid using Easyjoint and go with the Vdw 850, which is a better product but like I said more expensive but you get what you pay for.