referring in detail to the drawings , in which identical parts are identically marked , the invention makes possible the application of an adhesive reinforcing system 2 to the corner portion 4 of a rectangular shaped structure 6 by the spraying of a heated composition 8 by the spray wand 10 extended into the interior 12 of the structure 6 via the access hole 14 . as can be seem from this illustration , the present invention makes it possible to provide even inner surfaces of preformed structures with adhesive reinforcing systems , a feat denied to reinforcing systems disclosed in the u . s . patents cited above . following the spraying of the composition 8 heated , for example to a temperature of 180 ° f ., the system layer 2 will be cured by heating the layer 2 , either directly , e . g ., by application of infrared light thereon , or indirectly , e . g ., by heating the entire structure 6 , to a temperature above the spraying temperature , e . g ., 250 ° f . or higher . in fig2 & amp ; 3 , the curved sheet 20 of steel metal has the central area 22 thereof reinforced by a layer 24 of cured epoxy resin containing composition formulated in accordance with the invention . the success of the present invention is due , in part , to the unique combination of commercially available raw materials to produce carefully designed resin systems that possess a balance of adhesion , viscosity and strength properties . as such , material specified herein by tradenames may be assumed to be interchangeable with generically equivalent materials or those bearing the same chemical abstract service registry numbers and having equivalent properties to the recited material . hence , the generic substitution of materials falls within the scope of the invention . in the following working examples of compositions of the invention , all parts and percentages are by weight . a propeller - stirrer type reaction vessel was charged with 64 . 3 parts of &# 34 ; epon 828 &# 34 ; resin , 4 . 3 parts of &# 34 ; epon 1007 &# 34 ; resin , 17 . 1 parts of &# 34 ; hycar ctbn 1300 × 13 &# 34 ; copolymer , 14 . 3 parts of bisphenol a and 0 . 013 parts of triphenylphosphine catalyst . then while slow stirring of the admixture continued , the vessel and its contents were heated to 150 ° c . for one hour to produce a heat curable epoxy resin system comprising the reaction product of the &# 34 ; epon &# 34 ; epoxy resins with the &# 34 ; hycar &# 34 ; carboxy terminated copolymer . a sigma mixer was charged with 50 parts of the resin system of example 1 , 10 parts of &# 34 ; epon 828 &# 34 ; resin , 3 parts of dicyandiamide , 1 part of n , n - dimethyl - diphenyl urea , 1 part of &# 34 ; bud - 2000 &# 34 ; urea adduct ( texaco chemical co . ), 15 parts of wollastonite ( w20 grade ), 15 parts of mica 3 × flakes , 3 parts of &# 34 ; cs - 1361 &# 34 ; organophosphate ( witco chemical co .) and 1 part &# 34 ; a - 1100 &# 34 ; silane ( monsanto chemical co .). after through mixing of the components , the resulting viscous composition was extruded from the mixer . a quantity of the composition of example 2 was charged into spray equipment capable of heating the material to be sprayed therewith . with the composition heated to a temperature of about 180 ° f ., it was sprayed onto a 30 mil thick steel panel so as to coat one side thereof with a layer of the composition having a relatively uniform thickness of about 60 mils . the composition was easily applied to the panel from the spray gun and exhibited no running or sagging during the application . when the spraying operation was completed , the coated panel was placed in an oven and heated at a temperature of about 350 ° f . for 30 minutes to effect a complete cure of the sprayed reinforcing resinous layer . during such curing operation , no sagging , slumping or loss of adhesion of the layer to the metal panel occurred . at the completion of the curing operation , the reinforced metal panel was cooled and subsequently subjected to flexibility and other physical property tests which showed such reinforced panel to have greatly improved flex strength and other improved properties as compared to the untreated panels . further , during the testing and other handling , no separation of the resinous layer from the metal panel occurred nor was there any indication of a possibility of this happening . the procedure of example 1 was repeated using the following components in the parts stated : ______________________________________ &# 34 ; epon 828 &# 34 ; epoxy resin 71 . 8 &# 34 ; epon 1007 &# 34 ; epoxy resin 3 . 4 &# 34 ; hycar 1300x13 &# 34 ; copolymer 13 . 5bisphenol a 11 . 4triphenylphosphine 0 . 013 . ______________________________________ the procedure of example 2 was repeated using the following components in the parts stated : ______________________________________product of example 4 58 . 35dicyandiamide 1 . 50dimethyl phenyl urea 0 . 70 &# 34 ; bud 2000 &# 34 ; urea adduct 6 . 543x mica 18 . 10w20 wollastonite 10 . 80 &# 34 ; cabosil ts - 720 &# 34 ; silica 3 . 40 &# 34 ; a1100 &# 34 ; silane 0 . 12 &# 34 ; cs - 1361 &# 34 ; organophosphate 0 . 45 . ______________________________________ in the foregoing examples &# 34 ; epon 828 &# 34 ; is a bisphenol a type liquid epoxy resin and &# 34 ; epon 1007 &# 34 ; is a solid bisphenol a type epoxy resin , both marketed by shell chemical co . numerous other useable epoxy resins are commercially available which may be selected as equivalent substitutes by those knowledgeable about this known class of material . the &# 34 ; hycar ctbn 1300 × 13 &# 34 ; elastomer is a carboxy terminated ( ct ) acrylonitrile butadiene copolymer made by b . f . goodrich chemical co . numerous other useable carboxy terminated elastomers , including ct styrene / butadiene copolymers , ct styrene / isoprene copolymers , ct butylnitrile rubber , etc . are commercially available which may be selected as equivalent substitutes by those knowledgeable about this known class of material . the &# 34 ; bud - 2000 &# 34 ; product marketed by texaco co . is a polyether diamine urea adduct which acts as an accelerator for the curing catalyst , i . e ., the dicyandiamide , and also as an impact modifier for the total composition . other polyetherdiamine urea adducts may be used in its place in these new compositions . the &# 34 ; a - 1100 &# 34 ; product marketed by monsanto chemical co . is an aminoalkyltrialkyloxy silane used in the new compositions to assist the resins therein to couple to the particulate components . a variety of other silanes with similar properties are available and may be substituted for this particular silane . the &# 34 ; cs - 1361 &# 34 ; product marketed by witco chemical co . is an organophosphate soap used in the new compositions to assist in cutting through oil that may be present on the surface of sheet metal or other web to which the new reinforcing systems are applied . a variety of other soaps with similar properties are available and may be substituted for this particular soap . the &# 34 ; cabosil ts - 720 &# 34 ; product marketed by cabot corp . is a high surface to volume ratio fumed silica which serves in the new compositions as a thickener and a thixotrope . a variety of other silicas with similar properties are available , e . g ., &# 34 ; hysil t233 &# 34 ; & amp ; &# 34 ; hysil t600 &# 34 ;, and may be substituted for this particular fumed silica . wollastonite is a naturally occurring fibrous calcium silicate mineral used in the new compositions as a reinforcing filler . various other silicate minerals with similar properties are available and may be substituted for this particular silicate . mica is a naturally occurring plate - like aluminosilicate mineral used in the new compositions as a reinforcing filler and hydated alumina , e . g ., aluminum trihydrate , is a standard filler for resinous composition that is non - reinforcing . an optional class of material for inclusion in the new compositions is low molecular weight polyamides such as &# 34 ; v15 epon curing agent &# 34 ; and &# 34 ; v40 epon curing agent &# 34 ; marketed by shell chemical co . to serve as impact modifiers for the new adhesive reinforcing systems . various other polyamides with similar properties are commercially available and may be substituted for these particular polyamides . another optional class of material for inclusion in the new compositions is epoxidized polyalkylene glycols , e . g ., &# 34 ; der - 736 &# 34 ; and &# 34 ; tv - 720 &# 34 ;, epoxidized polyethylene glycols marketed by dow chemical co ., to serve as flexibilizers for the new adhesive reinforcing systems . various other such glycols with similar properties are commercially available and may be subsituted for these particular glycols . the foregoing specification discloses new sprayable , one part , adhesive reinforcing compositions that before and during spraying in heated condition , e . g ., 180 ° to 200 ° f . are uncured , but which after spraying on a substrate may be cured at temperatures of 250 ° f . or higher to a fully hardened state . these compositions do not exhibit any sag when sprayed in thicknesses of up to two times or more the thickness of the substrate . since they are sprayable , they may be used to reinforce substrates that have been impossible for such treatment by prior known systems because of their contour or blockage by adjacent structures .