I am currently in the process of trying , again, to abate the water leak that is coming in somewhere around where the tubes join the floor. About a month ago I applied Loc-tite vinyl cement around the whole seam ..with about two days worth of success.I then tried to seal the junction on the inside of the floor where the flap of material from the floor overlaps the flap of material from the side tubes...one day of success. Yesterday I turned the boat over, seriously prepped....acetone and sand paper for an application of spray vinyl leak sealer...Rust-o-leum( see paint section a H DEP ot).This stuff sprays pretty well.. and comes in clear , white , black or gray).They say spray a light coat, wait 45- 60 min, repeat, etc.which I did , to the area where the water seems to enter, which is the very rear( also where most of weight of battery, motor and my seat, and floor join) They then say to wait for 7 days while the vinyl cures. OK ..I am good with that ,,if the stuff works...
BUT.., I am convinced theses seams are not designed for the downward pressure exerted by all of the above mass, and it may be that the difference in the M3...and M4 in size may be the the ability to redistribute the weight around, with a little larger boat..the M4 being more suited for a battery, motor and weight primarily in that area for long periods of time. Not sure..but cost of materials ...from start to finish at this point is close to cost of another Mariner 3.
I have also discovered, that I thought I bought this boat brand new...but discovered on the first air leak patch with the Seyvlor liquid vinyl repair( it leaves a small glossy spot where you make the patch...) a number of these small glossy patches at various places on the boat.
I did not apply these....so logic tells me it was patched before I purchased it..and therefore was used. I am about to go on a mad rant-n-rave to the company I bought it from...so no names mentioned at this point.....but I am about to scream bloody murder....because this water leak may be from seams that had previously been used, and thus more worn and more susceptible to failure. My "magic 30 day warranty" is way gone...so my only resort is to name call and re-write the hundred of reviews I have made about the glowing wonderful experience known as the "Mariner 3 purchase" .