Do not apply over paints or materials that are soluble inwater. Paints must be firmly adhered to thesubstrate. New paint should cure 7 daysbefore applying Weld-Crete. Glossy painted surfacesshould be dulled with an abrasive. On newly placed Concrete floors to receive a bonded topping, give the surface a rake or broom finish.Ħ Surfaces withform-releasing Agents, curing compounds, hardeners and sealersmust be compatible with Weld-Crete. Degreasingsolvents such as Varsol are also to receive Weld-Crete MUST BE STRUCTURALLYSOUND. An economicalmethod for cleaning Concrete floor surfaces is to use a 10% muriatic acid solution followed by a thorough washing. If preparing an old Concrete floor surface(steel trowel finish), mechanically scarify the surface and follow withan acid wash and thoroughly rinse with clean water. agent : Weld-Crete, Larsen Products Corp., Jessup, to receive Weld-Crete MUST BE CLEAN, free fromloose material, dust, dirt, oil, grease, wax, loose paint, mildew, rust,laitance or efflorescence. Weld-Crete to job in original container with seals unbroken and use without Storage: Protect Weld-Crete from and surface temperatures must be above freezing duringapplication of Weld-Crete. tested & field bond retains strength & & Plaster Bonding Systems Worldwide since 195203050/LARBuyLine 0465 Division 3 & 91. No bond failureafter 25 consecutive unaffected by alkalinityof ExpectancyLab. HoseStream testsfor fire meets Resistance1 Concrete slabsbonded to1/2 gypsum Plaster subjectedto seepage of strong deter-gents & synthetic urine for 10hrs. Freeze-thaw miceexposed to 30cc volatilized Bonding agentfor 1 hr.Ĥ Non-toxic, no illeffects after 7 ResistanceASTM E-119(bonded assembly). RangeASTM C-932( Weld-Crete ) ASTM C-631( Plaster - weld ) specimens brought to 145 F,no bond Stability5 cycles freeze(-10 F &thaw). 603 Bond StrengthASTM C-1042(slant shearcylinder test). after28 Bond StrengthASTM C-78( Concrete beamslaminated with bondingagent). after 28 C-631for Plaster - weld, average 304 psi. Concrete, brick, block,glass, ceramic tile, wallboard, metals( sheet lead in x-ray rooms) andmarble are suitable surfaces.ģ Plaster - weld can be used over paints havingoil, rubber, or vinyl bases, and oversilicone-treated surfaces, as well aslatex & Plaster Bonding Agents8264 Preston Court Jessup, MD 20794 ( Weld-Crete & Plaster - weld )PropertyTest Method & ResultsTensile Bond StrengthASTM C-932for Weld-Crete ,average 485 psi. Plaster - weld prepares the surface to allow you toplaster directly to Concrete over electric radiant heat cable, and tobond cement mortar beds to smoothconcrete for installation of rigid foaminstallation. Highperformance Bonding of one-coat finish Plaster and/or two and threecoat work to Concrete ceilings, walls,columns, beams, and other structurallysound surfaces. For exterior and interior will bond new Concrete ,portland cement Plaster, and cementi-tious mixes to structurally sound Concrete floors, walls, columns,beams, steps and can be painted on in a singleapplication 1 to 10 days prior to Concrete Weld-Crete s open time to youradvantage in Bonding to concreteshear walls, where you need a timelapse between application of bondingagent, placement of reinforcing steel,placement of formwork and placement of is also used for bondingsetting beds for ceramic tile and forbonding portland cement Plaster andstucco mixes.Ģ And to bond to such surfaces as brick, block, tile, marble,metal, glass block, soundly adhered paint (non-soluble in water), and The original Plaster Bonding agent is a patented formulation incorporatingpolyvinyl acetate for interior use only. 1 Weld-Crete The original chemical Concrete bondingagent incorporates polyvinyl acetatehomopolymer in a patented formula-tion.
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