yes the primer mike wye does is very good, bit pricey tho....just as better off using bondit or wba, same principle...it is dangerous territory lime on plasterboard...lime is hygroscopic, it attracts moisture to its cell spaces then releases it regulating humity in a room...moisture with gypsum over time degrades, especially the diydrate gypsum in plasterboard....hence either go with 1 or the other and explain to the customer the reasons why.......i have in the past matched in a couple of boarded areas...sealed the boards, then used 2 to 1 lime putty gauged with casting plaster....as for suction control, there is nothing i can honestly say that will relate specifically to any 1 application....water and lime is a fine balance...oversoak the sub and u could create bond failure and it will blow, too little and it will crack and it will fail to carbonate....a couple of coats of lime wash will slow suction down without compromising breathability....if your on a high suction background spend time just watching what the suction is doing and bring more guys on to it if need be...u will need to mist as u go...and also be back each day to soak it down.....cracking is common place when working with lime and is what will put off the majority as will the slow drying times...this is what takes years to learn its preperation of the mortars and prep of the sub and your aftercare....closing in fissues and overworking will leave a limewash patchy and can create other problems later down the line, and again your customer is payin doe, so a patchy finish is going to leave u bombarded with questions with very little solution to rectify this...although to be fair, its not a perfectly uniform finish anyway and there are some superb breathable emulsion paints out there now and clay paints!!!......i'd recommend to any novice starting off to have a go with hydraulic lime first....non hydraulic systems and should be left to experienced lime plasterers....
danny, where abouts are you based....i've got a job starting in burford at a stately home called swinbrooke house...was damaged in a fire last april....not confirmed a date with the contractor yet, but its 3 coating on to lath...pm over your details and i'll keep u posted as things develop....yes the hemp lime is a great product, they now do a dry hydraulic mix which gets around the problem of using it in damp rooms and walls where the hemp lime takes forever to go and even grows mould lol....