I have a 102 yr old colonial here in Ohio that sits on a sandstone foundation. The foundation is painted white. I have been in this home for over 20yrs and within the last year or so, the paint has been peeling away on the south side. I bought a good masonary Paint/Sealer, took off the old paint and would like to get it done before winter sets in, but have noticed that there are some good size gaps inbetween some of the stones. I would like to know if I should fill those gaps in and with what, or just try to get as much sealant paint that I can inbetween the gaps?. I am aware that the sandstone needs to breath and it looks as though some of the stones have somekind of caulking between them, and I really dont want to mess anything up by caulking when I shouldn't. Plan on being here another 20yrs and would really like to avoid any major foundation work in the future.