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11/15/99 MON 10:23 FAX 9055700305 A-C-M Emery - Lazar They tend •to be sluw curing at low temperatures and hi~h humidity, t~ave poor water resistance, ~etain dirt and may whiten when wet. C~oos 5 (ir) Solvent based Acrylic These will, in the short term, enhance the colour of pavers, provide stain resistance and generatly crea~e a glossy finish to the surface, providing an aesthetic appeal for some individuals and an unnatural look for o~hers. The main disadvantage of d~is [ype of sealer is that, in ~eneral, they do not have good elastomeric properties. . ~ -° - ;`~ d3 ,.~°_ ' ~ (iii) Maisture cure Llrethane --~,~~ ~-i~~'~ ~%_::,~~ ~,~, ~ ' The most effective sealer/stabilizer havin good Iong term~erformancwe~ has been found to be a tow v~scosuv urethane pre-pol~,mer having a solids content of approximately 20% - carried in a hydrophobic soivenc, whose curing is catalysed by moisture in the substrate and in the atmosphere. This type of polymeric sealer is highly elastomeric, having an elon~aiion at braak in excess of 400%. The final polymer has an amount of cross-linkage present such that it provides good resisrance to solvenu, (e.g. fuels and de-icin; materials). It effectively seals and stabiIises jainting sand and imparts a natural, non giossy finish to ~ the svrface of eonerete blocks with a single coa[ applieation. Additional coats will provide a gloss finish, if desired. vlethods of application ~ Whichever sealer is used it is essential that the manufacturer`s instructivns regarding application are heeded. Most sealers wil! contain hazardous substances and strict compliance with any heatth and safety guidance is essential. The area of block paving to be sealed will usually determine the method of application to be used. Figures 2,3 and 4 below show proven methods that rnay be used for treating small to very large areas of block paving. - Fig. 2 Manual applicatian using a foarn rubher squeegee - For small areas