lots of people have different ways to fix cracked plastic.
some like aluminum on the back side and then drill holes and use pop rivets. it is a strong fix and if you space rivets it can look ok.
drilling holes and using zip ties are also an option. not as strong but a decent simple solution.
another option is to buy a plastic welding kit. you might want something to practice on though cause ive seen some horrible looking jobs but have also seen it look good as new
i have tried all of these but now the only way i do it is using fiberglass on the back side. it is super strong and keeps the plastic looking nice cause you dont see fasteners on top. just scuff up the underside area well with some 60 grit. get some resin and fiberglass from local napa, autozone, lowes. cut some pieces to cover crack and enough for 2-3 layers. each layer should get a bit bigger. they can all be applyed in one shot. use a paint brush to apply some mixed resin to plastic and then lay down some fiberglass and dab the resin in with the brush. just lay down each laer and repeat. if you find a way to properly hold each side of crack together or find a way to set it so it does it on its own, the crack will look like a deep scratch and the area you fiberglass will be stronger than the rest of the plastic around us
thats just my suggestion, good luck to you
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