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I just wanna say i have found the problem after many test patches Its the lime My last test patch ( top coat)consisted of 5:1, s:c 3 x 5 litre caps of freeflow w/p using wickes plastering sand and no lime. and after 3 weeks still no crazing, It must be the lime ive tried everything else Even...

actually trying the wickes plastering sand now. it is better than i thought. its well graded and alot cleaner than i thought. Its the b & q diall sand thats crap, way to much silt in that s**t.

The Travis plastering sand is exactly the same grade as their building sand. And the only plastering sand we can get here is wickes or b& q but I done a silt test on both and both 20-25% silt . So shite

i might have a go at holding back on the lime a bit as with this pit sand as pagey said it really holds in the water to long and the lime is gonna hold it in even more

sorry read wrong my mistake

do u use that much water proofer in scratch coat, see i find that too much

That yellow sand your on about, is it pit sand?? ive just got some of that in, really fine, mixes up really nice and creamy and gives a really fine finish if its the same stuff. and this stuff holds the water better too which shows its well graded, the building sand the water used to come to top...

what part of the country you from as different places have different sand

Yea I think it is . I have Bern plastering rendering for over 20 years and never had this problem before. It's been frying my brain to be honest. Have been doing mostly internal work for last year and I come to this and am really disappointed with this happening

Not at all Appreciate all feedback but I really think it's the sand we 're getting in South Wales is not well graded enough. We're getting all the dredged s**t. I'm gonna try some pit sand that Travis can get in from up north. See how that works out. I tried a 5:1:1 with waterproofer but still...

are u saying a 4:1 is too strong??

and also lime is a natural plasticiser. so dint add any instead of waterproofer as the problem may have been over plasticising

No not this time, i did the first patch, i used a 6:1:1 with waterproofer and it crazed , then i tried patch 2 without waterproofer as it states on back of waterproofer tub " do not use with lime based mixes" which is pretty vague. does this mean lime putty, hydraulic lime, or lime in general...

I forgot to add that it's had 2 scratch coats as the wall was pretty uneven, first 3:1 and second 4:1 with relevant curing times in between so 6:1:1 should of been fine and it didnt dry out too quick either

Hope someone can help I have scratch coated wall using 3:1 1 sharp,2buiding sand: 1 cement with waterproofer . Left it cure for 1 and half weeks, wet scratch prior to top coating , waited for water to soak in so just damp and still suction then top coated using 6:1:1 , 3 sharp Sand, 3 building...