Fine Exterior Filler for concrete rendering

[davy]

All,

After scraping some loose paint from some rendering there is a noticeable change in surface texture of the concrete render where it does not have any old paint on the surface. The majority of the old paint surface ie 95% sound and does not need to be removed. I somehow need to build back up the surface where the old paint has been scrapped back to concrete so that the final paint coat looks uniform over the old piant and the newly exposed surface.

What kind of filler can I use that won't crack because it will be applied very thinly? Normal exterior white filler seems very soft.

thanks for any help

Davy

[The Natural Philosopher]

You MIGHT have a look at some 2 part epoxy 'mortar' - I got some to fill a place where some render had fallen off, and it has a perfect grainy surface texture to match sharp-sand render. Dries rock hard and seems to stick like shit to a shovel..Cheap it ain't tho...

[meow2222]

presumably the old paint contains sand or other aggregate. If so, sand plus glue is whats needed. Exterior building glue should do that, with suitably sized sand, or other grainy stuff.

NT

[davy]

Thanks, but I think I've not explained my problem clearly.

The rendor wall has old sound paint on most of its surface while the the area that is void of paint is just bare rendor. The step change in height between old painted surface in conjunction with the different surface textures makes the final paint finish look poor.

I'd hoped that by filling in the void that used to contain paint that the step height change in the paint surface would then be hidden. Of course I could paint the missing areas until the thickness is matched but this somehow doesn't seem right.

davy

[e-mail] wrote: