Advanced Stone Seal
First Coat Application
Advanced Stone Seal
Second Coat Application
After 1 week
Result after 1 week (Mid-September 2015)
March 2016
Result after 10 months (March 2016)
September 2016
Result after 14 months - end of trial - September 2016



1st coat: Not as gloopy as Advanced HD but still thick and strong smell

2nd coat: Very sticky with 2nd coat and a real sense of it being a surface sealant (topical) rather than an impregnator


Very noticeable for first few months but after one winter, it evens out to become barely visible.

By the end of the trial, it's only just possible to see the sealant and, while it has kept much of the algae (the greenery) at bay, some has managed to establish itself at the 'bottom' edge where it was adjacent to an open edge at the lower edge of the shed roof.

Looks to perform well but, given it's a specialist sealant for stone, maybe it should have fared better than its non-specialist sibling, Advanced HD Sealant .

Stain Trials

stain application
Application of stains

stain after 4 hrs
Stains after 4 hours
wash off stain
Wash off stain with proprietary cleaner after 24 hrs
apply mosskiller
Apply mosskiller after wash-off
stain after cleaning
Stain 48 hrs after washing-off mosskiller and cleaning with proprietary cleaner


A good performance, but seeminglly not as good at defeating these stains as the HD Sealant from Advanced. The engine oil has left a very meek trace but the BBQ fat has definitely left its mark, as evidenced by the detectable presence of the second, accidental splat! No trace of the ink or wine and the trteated area shown no sign of the mosskiller although it can be detected right at the edge of the tereted/untreated area, which indicates the sealant has been effectrive.

A pity about the BBQ fat but definitely still a good product.

Note: Any apparent variation in colour of the flagstone is due solely to changes in the condition of the natural daylight at the time the photograph was taken.

Other than cropping to exclude extraneous background and adding a drop shadow to the cropped image, there has been NO post-processing of the original photographs.


Advanced Stone Seal is available from:

Advanced Sealing Solutions

Advanced Stone Seal
Advanced Stone Seal

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