I'm also on my third mr2 mk1 and its also a 1986 mk1b

mine pretty dam solid just had its mot and no issues

,rustproofing lol
mine just doesnt go out in the rain and has a warm garage

waxoyle down all those gaps from the boot down the arches

,in the a and b posts

,waxoyle everywhere lol

,mines been saved by waxoyle and garaged by the previous owner

,if yours is in good condition there will be waxoyle all over it

,because its the only way to save these cars